The only theatre in the world constructed specifically for sound movement.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

The capitol city's oldest existing cemetery.

The California capital city once stood 10 feet lower than it does today.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

Charles Babbage's proto-computer, painstakingly brought to life.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

This little-known rival to the Library of Congress houses one of the largest collections of pre-1876 American books, newspapers, and manuscripts.

One of Belgium's oldest hospitals saw patients from the 13th to 20th centuries before becoming a museum.

These ruins reveal the remarkably intact layout of a Roman marketplace.

A 141-foot wave of crashing lumber guards the entrance to the Grand Place in Mons.

A visionary precursor to the Internet made of index cards.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

20,000 pieces in a Frank Gehry-designed building.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

An unusual assortment of art, furniture, and other curiosities.

A 115-year-old restored German dining hall awaits those who venture beneath the Minnesota State Capitol.

A collection of pianos and more guaranteed to delight anyone interested in music history.

World's largest carved onyx figure stands as a tribute to enduring peace.

This hidden fire lookout offers spectacular views of Sequoia National Park.

Four hundred granite steps were built into this massive rock by the National Park Service.

Quite simply the largest tree in the world (by volume).