The upstairs reading room is packed with millions of rare books, literary manuscripts, and historical treasures.

This groundbreaking 16th-century map is known as "America's birth certificate."

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

The ruins of Theodore Roosevelt's beloved ranch stand in a forgotten corner of a national park named after him.

Will Geer's outdoor theater started as a mountain retreat for actors, musicians, and other artists who were blacklisted during the Red Scare.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

In a historic steel foundry east of the Mississippi River, thousands of wooden crates hold the architectural remnants of buildings long gone but not forgotten.

This is not your typical jungle gym.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Tracing a path of more than four miles around a frozen lake, this is the longest skate trail in the United States.

This stucco building in North Africa was the first American-owned property on foreign soil.

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

A breathtaking 19th-century trail overlooks Lake Tahoe.

A remarkable lava formation encloses a line of Buddhist statues that can't be accurately counted, according to local mythology.

A serene desert oasis speckled with ancient artifacts.

Historic, 19th-century wagon wheel ruts cut into soft volcanic ash.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

This mountain trail inspired Nietzsche to complete his magnum opus.

Fantastic collection celebrating the final send-off.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

A priceless work of art created by the saint's own blood sister hangs in a San Antonio basilica.

Texas's oldest bakery serves authentic German pastries, including legendary strudel.

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.