The final resting place of the poets Shelley and Keats.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

Climb inside an iron crystal magnified 165 billion times its normal size.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

A cluttered and astounding collection of antiquities and curiosities.

Little Red Lighthouse under the George Washington Bridge.

A tower devoted to — and modeled after — the Divine Comedy.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

The first pet cemetery in the United States.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

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

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

New York's unstoppable progress turned this cemetery into the smallest burial ground in the city.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

A massive art collective tries a new take on Brooklyn's DIY music scene—by making it fully legal.

The curios of pharmacist and collector Henry Wellcome.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

A historic house left in "dramatic still life."

A quiet memorial to those who died saving others in the heart of the City of London.

This South London cemetery holds the remains of more than 15,000 people.

Ship-sized kinetic sculptural fantasy.