It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

Living trees form the structure of an open-air palace.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

A Jenga-style cylindrical tower of books that appears to go on forever.

This massive redwood tree has a hole in the base big enough to drive through.

The eccentric mansion of one the most popular horror authors of modern times.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Stay in a room with a view... of the bottom of the ocean.

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

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

A giant 400-acre preserve in North Florida for displaced wolves.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

Treehouse motel and treehouse-building school.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

The longest living non-clonal organisms on Earth.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.