Ұлттық қазына: Жасырын кітап

2007 film by Jon Turteltaub

It was stated in the first film's commentary that there were no plans for a sequel, but due to the first film's impressive box office performance (earning $347.5 million worldwide), a sequel was given the go ahead in 2005. Many scenes of historic locations were filmed on location, including the scenes at Mount Vernon and Mount Rushmore. The beginning of filming was marked by the performance of a smudging ceremony by Gerard Baker, superintendent of Mount Rushmore and a member of the Three Affiliated Tribes. Filming at Mount Rushmore took longer than initially scheduled, due to inclement weather and the decision to change the setting of additional scenes to the area around Mount Rushmore to take advantage of the Black Hills backdrop. making it the ninth highest grossing film of 2007, and the highest grossing film in the series. It took 38 days to outgross the first film ($347.5 million).

On Rotten Tomatoes the film holds an approval rating of 36% based on 130 reviews, with an average rating of 4.80/10. The site's critical consensus reads, "A talented cast goes to waste in the improbable National Treasure: Book of Secrets, which is eerily similar to the first film." On Metacritic, the film has a weighted average score of 48 out of 100, based on 26 critics, indicating "mixed or average reviews". Audiences polled by CinemaScore gave the film an average grade of "A−" on an A+ to F scale. Roger Ebert gave the film two out of four stars. British film critic Peter Bradshaw of The Guardian disputed the implication of British support for the Confederate side in the American Civil War.

The film earned two Razzie Award nominations including Worst Actor for Nicolas Cage (also for Ghost Rider and Next) and Worst Supporting Actor for Jon Voight (also for Bratz: The Movie, September Dawn, and Transformers), but lost both categories to Eddie Murphy for Norbit. The film was nominated for Best Movie at the 2008 MTV Movie Awards, but lost to Transformers.

National Treasure: Book of Secrets was released on DVD, UMD, and Blu ray Disc on May 20, 2008 (June 2, 2008 in the UK). In the opening weekend, 3,178,631 DVD units were sold, bringing in $50,826,310 in revenue. As of August 2009, 5,873,640 DVD units have been sold, generating revenue of $93,132,076. This does not include Blu ray Disc sales or DVD rentals. The film has been retitled National Treasure 2: Book of Secrets for all three releases. The film's official website has also been changed accordingly. A special edition, called the "National Treasure Presidential Edition", contains National Treasure and National Treasure 2: Book of Secrets inside a letter book which is a replica of the Presidents' secret book from National Treasure 2: Book of Secrets.

Disney Press published an official novelization of the screenplay titled National Treasure 2: Book of Secrets The Junior Novel on November 6, 2007. Parts of the story in the novel version differ slightly from what was actually filmed, owing to changes being made in the screenplay prior to and during production. For example, in the novel, Ben and Abigail photograph the wooden plank found hidden in the Queen's desk and leave it behind, with the car chase following. However, in the movie, they take the plank with them on the chase. Also published on the same day as the official novelization was a companion youth novel Changing Tides: A Gates Family Mystery by Catherine Hapka. Its story is set in England in the year 1612 and is the first in a series of planned historical novels about the Gates family. The epilogue from Changing Tides is included at the back of the National Treasure book. The second youth novel by Hapka, Midnight Ride: A Gates Family Mystery, was published on March 8, 2008.

The group mentioned in the film as being behind the assassination of Abraham Lincoln and pursuing the city of gold, The Knights of the Golden Circle, had actually disbanded in 1863. It was based in Cincinnati, Ohio, where its founder George W. L. Bickley resided. Though a native of Virginia, Bickley had actually been known for being an adventurer and also bad with finances. While some members of the group would join the Confederate Army, Bickley was more focused on colonizing parts of northern Mexico as slave states. Following the outbreak of the American Civil War numerous Golden Circle members were not focused on fighting Union states north of the Mason Dixon Line as the film suggests, but were pre occupied with making the Union territory of New Mexico a part of the proposed Golden Circle nation as well. Those who operated in the North mostly aligned with Copperhead politicians who preferred a negotiated end to the war. Bickley, who served the Confederate Army for months as a surgeon to General Braxton Bragg, would be captured in Indiana in July 1863 on charges of being a Confederate spy and remained in house arrest until October 1865. This successor organization was exposed the same year it was founded and members were arrested and tried for treason. The film's suggestion that Britain wanted a strong alliance with the Confederate States of America was also highly unlikely. Efforts which were made by Confederate Secretary of State Judah P. Benjamin to persuade Britain to simply recognize the Confederate States of America proved unsuccessful. The wooden plank map hidden within both Resolute Desks that leads to the location of Cíbola would have been of no use to the Confederacy, as the desks were constructed and delivered between the years 1879 and 1880, some 15 years after the American Civil War concluded and the disbandment of the Confederate states. Similarly, the clues left by Édouard Laboulaye would have been equally of no use, as the earliest models of the Statue of Liberty and all subsequent replicas were all constructed no earlier than 1875, 10 years after the end of the Civil War.

In May 2008 Jon Turteltaub confirmed that there would be additional National Treasure movies, but acknowledged that the creative team would take their time on the second sequel. That same year, The Walt Disney Company registered the IP for the domain names for future films. In October 2013, Turteltaub stated that all individuals involved with the first two movies want to make a third film. He further stated that the delays have been due to working out the script, and that he expected the film to begin production in 2015. By 2014, producer Jerry Bruckheimer announced that a new team of writers were working on the script. In May 2016, Nicolas Cage confirmed that the script was still being sorted out. By September 2017, it was revealed that a script had been finished, but that the executives at Walt Disney Studios Motion Pictures were not satisfied with the story. In July 2018, Turtletaub stated that the script was "close", but the studios still weren't going to green light production yet. In January 2020, after years of development hell, it was announced that a third film was officially moving forward with a script from Chris Bremner. Jerry Bruckheimer will return as producer and the original cast is expected to return as well. In April 2022, Nicolas Cage was hosting an AMA (Ask Me Anything) thread on Reddit where he commented on the possibility of future installments: "No, the priority was to turn it into a TV show so I would say probably not." At the D23 Expo of September 2022 it was announced a sequel TV series will be released on the Disney+ streaming service. The title of the series was also confirmed respectively National Treasure: Edge of History. Lisette Alexis was confirmed to play the lead role of Jess, a 20 year old DREAMer who sets out on an adventure to uncover her family's history. Cage confirmed he would not be reprising his role for the series. Jerry Bruckheimer was confirmed to serve as executive producer for the series. The series had a two episode premiere on December 14, 2022.