This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The only museum about the history of dentistry in Canada.

One of the foremost Sherlock Holmes collections is hidden away at a Toronto library.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

This majestic building, where Brazil's coffee brokers once bought and sold beans, now houses a coffee museum.

Hot springs monkey spa in the middle of Hell's Valley.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Fossils, railroads, and waterfalls!

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

Secret refuge and museum of the Duke of Florence.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Five candy-colored villages on the Italian Riviera.

The world's northernmost aquarium looks like it has fallen over.

The world's most charming instant portrait studio also happens to be its smallest.

Museum dedicated to "the man who moved the Earth."

Romania's triumphal arch looks out over Bucharest.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

Five miles of underground river link lake to ocean.

A modern English garden of eccentric beasts, follies, and oddities.