The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The span is crooked and made from two older recycled bridges.

Decades before the scandal, this staircase on the river was a literal "water gate."

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

The walls of the iconic dome are hollow and have a secret stairway.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A colorful public mural in San Antonio's West Side encourages students to stay in school.

The LSU mascot lived on the college campus in one of the most impressive tiger habitats in the country.

A half-size replica of the World Trade Center towers above Tulsa.

One of the best examples of Art Deco architecture in the United States.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

These massive mitts are made of 30 tons of devotional bronze.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

An ivy-covered arch bridge dedicated to Tejano music singer and legend Rosita Fernandez.

Conflicting markers on its floor tell a tale of two city centers in San Antonio.

These boots are made for selfies.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

A tiny waterway named after a ghost story.

Some islands... they come, they go, especially on Lake Travis.

A 131-year-old wunderkammer of Texas history.