This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Historic medieval fortified city in southwest France.

This ancient theater was once the home of fierce gladiatorial battles.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

2300-year-old Roman road connecting the empire.

Rock face that shares a name with Mary Shelley's famous doctor.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

A decommissioned military complex that's now a modern industrial park.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Why have you never heard of the second most popular tourist site in New York?

Fossilized sea bottom and lime quarry.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Inspired by a music box, a small town Vietnam vet carved an entire carousel full of animals by hand.

San Francisco's newly reopened hands-on science museum.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The highest peak in the state of Vermont has some interesting features.

A massive sustainable farm designed by the mastermind behind Central Park.

Two distinctive homes on a New England village green look like a couple of frosted wedding cakes.