Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

This ruined relic of the medieval city of Jahanpanah is a quiet oasis in the middle of New Delhi.

A blooming house of worship for the masses.

A startling, centuries-old subterranean marvel hides in plain sight.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

An ancient iron pillar in Delhi that seems to be rustproof.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

All that remains of a Japanese fishing vessel that ran aground in 1982.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

The site of the deadly Triangle Shirtwaist Factory Fire.

New York City's only preserved family home from the 19th century.

This retired stagecoach tavern is the oldest building in Cleveland.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

The only presidential monument to display a late POTUS's actual casket.

Mysterious rocks that ring musically when struck.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

A little piece of Paris in the sultry south of the U.S.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

The first patented shaved-ice machine heralded a snowy wonderland of iced treats at a favorite New Orleans summer shack.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

The restaurant keeps a hidden séance room on the second floor and reserves a table for the spirit of the former owner each night.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.