It’s a painted window that looks completely real, hiding on a building in the market square.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

Yo, Adrian!

Alexander Hamilton’s creation caused quite a bit of controversy.

A former hardware store near Yerba Buena is the official home of California's history.

Two pillars set 10 paces apart commemorate the "last notable American duel."

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This overlooked courtyard and museum celebrate Benjamin Franklin's life and achievements.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

At just six feet two inches deep, it is said by Guiness and Ripley to be the world’s narrowest freestanding office building.

A building so large that it has its own weather.

These unusual rooms on wheels are holdovers from the 1960s.

Guns that have been defending San Francisco since 1904.

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.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

A blast from the past in central San Diego.

The world’s oldest active sailing ship.

This remarkably simple jail went over a century without an escape.

An extensive collection of ancient Egyptian artifacts and mummies.

This airfield played a key role in both World War II and the Cold War.

A comprehensive collection of Pez dispensers.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.