This sublime architectural marvel is a rare example of an expressionist church.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A huge musical instrument played by the ocean.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The video game-themed street art first popped up in the French city.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The United States Capitol's former columns still stand.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

This massive library holds what was once the largest book collection in the world.

The oldest continuously operating fish market in the United States.

Only hotel where you can legally launder money.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

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

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

Washington's iconic carousel has a nice piece of Civil Rights history.

Go take a picture with the inventor of the daguerreotype photographic process.