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

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

An emerald-green grotto just a short trip from Austin.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

The humble field where the first Major League Baseball game was played.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

After his presidency, George Washington planned to live only a few blocks from the Capitol building.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

An overlooked memorial honoring the local Washington residents who died in World War I.

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.