A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Once a bustling cotton factory, this early 20th-century building is now home to a thriving artspace.

FDR's Art Deco hospital tower was hopelessly inefficient.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

Two cannon-like cranes were installed on top of the bank building to fend off bad feng shui.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

A colossal floating restaurant built to look like a ancient Chinese imperial palace.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

The filming location of a shark attack in Steven Spielberg’s famous shark movie.

This candy-colored storybook village originated as a 19th-century Methodist campground.

This unique museum cafeteria showcases the history and regional diversity of African American cuisine.

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

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.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.