Under Hanoi’s medieval citadel sits a secret military headquarters from the final years of the Vietnam War.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

An oasis of beauty, tranquility and botanical research in the middle of Rome.

The large collection of pre-Columbian pottery might make you blush.

A monument to the conquistador became increasingly controversial in the very city that he founded.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Visiting dignitaries and Hollywood stars once stayed at this 1920s hotel, alongside ghosts that are said to haunt its corridors.

Visit Lima’s one-stop-shop for sustainably sourced and produced Peruvian chocolate.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

This stone complex marks the urban center of a lost civilization.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

A futuristic rocket marks the spot where three borders meet.

Art Deco stylings conceal the true nature of this bridge.

I Street Bridge is the heaviest swinging center bridge in the United States.

The California capital city once stood 10 feet lower than it does today.

A replica of the first public theater built in California.

Where the first "expert riders, willing to risk death daily" for the Pony Express were recruited.

The most impressive of Basel's three remaining city gates.

Three nine-foot-tall bathing beauties perched elegantly on life-rings welcome visitors to the Alki waterfront.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

Storyville was New Orleans' historic red light district and hotbed of jazz music, sometimes referred to simply as "The District."

A unique post-modern public space in the middle of the Warehouse District in New Orleans.

The beautiful, fruit-covered facade hints at this building's former life.