A riverside tiny house with books and other treasures galore.

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

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Rippling sand dunes frozen in the Arizona rock.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

Nestled between a college and a golf course, the garden is home to more than 2,500 rhododendrons.

If you forgot something to read during your trip to Tokyo, this hostel has you covered.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

The world's first cageless zoo is working to save endangered Tasmanian devils.

This wondrous hideaway is suspended in a bamboo forest above a sanctuary for rescued llamas and alpacas.

Unusual hexagonal rocks formed by cooling lava named for their resemblance to traditional Japanese tatami mats.

For decades, a bottle factory dumped their waste into these waters—now it's considered the best sea glass beach in England.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

On the edge of the Valles Caldera National Preserve, these rock formations create an eerie landscape.

This lone tree and dramatic sandstone outcropping are so beloved by Michiganders they can be found on one of the state’s coins.

Eastern zen meets Western grit in these four little trees growing out of a rock on Lake Tahoe’s Nevada shore.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

The largest of the Fuji Five Lakes is home to an impressive swan population—some real, some with paddles, and one with an observation deck.

A 70-foot-deep ice cave formed by lava from Mt. Fuji on the edge of Japan's "Suicide Forest." 

Perhaps the most spectacular grotto along the Algarve coastline.

A grove of "candelabra redwoods" deep in California's Lost Coast.