A tiny red pebble marks what may be the quietest outdoor spot in the United States.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

A colorful architectural gem in Seattle's uniquely modern Central Library.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

A house filled to the brim with oddities and curiosities.

Couple's personal collection of pinball machines turned public pinball museum.

This semi-secret storybook hedge maze is also the oldest garden in the city.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

Seattle's own bad art museum located inside Cafe Racer.

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

A whimsical village of unique treehouses resides in a Washington forest.

The only rotating bar in New Orleans has been slowly spinning since 1949.

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

The beautiful baroque library of the Hapsburg empire.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

This frequently-photographed waterfall takes only a short hike to visit.

Hollowed out cedar log tubs set in an ancient towering forest.