Designed to commemorate the founding of the first settlement in Delaware.

Once used as a deterrent to drinking alcohol.

What began as an art installation is now the private drinkhaüs for a brewery's employees.

This controversial reel is an artifact of the largest fish processing plant in the country, and a symbol of Delaware's integration.

A grotesque Fiji merman dwells within this traditional Dutch-style building.

World War II-era bunkers are hidden under the beaches of this picturesque park, which is still scattered with wartime watchtowers.

The historic home still shows the scars from a little run-in with the British in 1813.

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.

The only Leonardo Da Vinci painting in the Western Hemisphere.

This large garden vase urn has nothing to do with the seventh U.S. President—it was designed by one landscape designer to honor another landscape designer's contributions to the National Mall.

One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

The accidental discovery of this gilt bronze head led archaeologists to find the Roman Baths in the city of Bath

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

A glimpse of the Pacific Northwest‘s indigenous culture in Washington, D.C.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

A cluttered and astounding collection of antiquities and curiosities.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

This fountain was designed to honor the man who helped bring water to Barcelona.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.