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

Behind an abandoned storefront is an example of pioneering 1930s gas station architecture.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A rotating cast of guys and dolls in front of a Washington, D.C. building.

The site of the climactic scene from the classic horror film is now a historic landmark.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

The grand marble structure next to the White House is Andrew Carnegie's temple to Pan-American diplomacy.

The bank that helped fund the Mexican-American War and the purchase of Alaska met its downfall after helping Augusto Pinochet launder money.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

The national park was once a plantation estate.

There’s a hidden military meme engraved on the World War II Memorial.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

The tallest tower in Cáceres's Old Town.

These ancient artifacts are a testament to the enduring significance of the bull in Spanish culture.

The largest medieval water tank on the Iberian Peninsula is preserved beneath the Cáceres Museum.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

Devastated landscape used for hundreds of years by the Romans as their primary mining site.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.