An alley way dedicated to graffiti and street art is a constantly changing street gallery.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

It's clear this abandoned Art Deco gem was no ordinary cleaners.

The bears may be gone, but their old cages can still be found.

The king of U.S. high points towers over every other peak on the continent.

A unique geological area spiked with wind-carved rocks that resemble teepees.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

This black shoreline is made up of exploded lava particles.

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

The Boston square dedicated to the dark poet who was born nearby.

An eccentric inventor's castle home with its own indoor weather system.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

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

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

St. Augustine's record-setting narrow street was designed to protect against pirates.

The first custom-designed building to showcase the works of Dale Chihuly is a wonderland of glass and light.

A luxuriant botanical garden below sea level.

A tribute to Ponce de Leon's supposed quest for eternal youth.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

One of the largest trees of its kind in California.

San Diego's most historic and haunted home.

The oldest continuously occupied public building in the United States.