The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The topiary maze at the Habsburg hunting lodge.

A spherical "micro-nation" in the heart of Vienna.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

The final resting place for the remains of 143 Habsburg royalty.

A former milk-delivery driver and his wife turn their home into a glimmering mosaic.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

A haunting collection of the vanished and disappearing natural world.

The oldest stone house in Paris was built by its most famous alchemist.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

The curious underground history of keeping Paris clean.

From dragonfruit to mangoes to durian this Thailand resort allows guests to stay inside all manner of giant fruit.

Nursery with extensive collection of flesh-eating plants operated by the author of "The Savage Garden."

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Discover for yourself what Herb Caen referred to as "the best kept secret in the Bay Area."

Historical trolley restoration and operation at History San Jose, Kelly Park.

The world's first permanently occupied mountain-top observatory continues to report on the stars.