An ancient ossuary in Rouen.

America's most famous piece of self-built architecture.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

A hidden subterranean installation offers a view of the sky.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

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.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This landmark cemetery in Boston was created more than 300 years ago.

Narrowest house in Boston.

One of the now-less-hidden floral gems of the "Emerald Necklace."

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The Boston square dedicated to the dark poet who was born nearby.

A beautiful Victorian-era cemetery, complete with a miniature village.

Two thousand artifacts from around the world collected by one woman who loved to travel.