A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A 16th-century horror show built in a lovely Italian garden.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Countless grotesque faces stare out from this eerie Prague art wall.

This ancient walled garden turns fog into food.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A cheeky reminder about the value of art dangles above one of Olomouc's busiest streets.

A bizarre house filled with an astounding array of collections.

A hidden three-foot-wide house separates these two regal churches.

Each winter this underground cave forms a dazzling ice palace.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

New York City's smallest piece of private property.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

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

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

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

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

New York's oldest magic store.