Few other hotels can rival the grandeur of the Castle in the Rockies.

The only surviving prototype for Buckminster Fuller's house of the future.

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.

One of many gator theme parks, abandoned in the sugar fields of South Florida.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

The unique ecosystem atop an Australian mountain is home to some colorful inhabitants.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

A hidden world of exotic succulents and cacti.

An underwater restaurant, surrounded by a coral reef.

66,000 pieces of art, donated by one of the world's richest men.

A gallery of underwater art that can be visited by man and fish alike.

A sacred lake composed of over 300 separate pools of highly concentrated minerals.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

Three million year old fossils are exposed for all to see on this Icelandic shore.

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

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

A mecca for India's Jains.

An architect's childhood fantasy treehouse made real.

An intricately carved Viking church overlooks a glistening fjord.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.