Enjoy the waters of this half-moon-shaped natural pool surrounded by breathtaking scenery.

Drift through underground caves on a tube.

This beachside town is home to a diverse nature reserve, multiple cays, and one of the three bioluminescent bays in Puerto Rico.

This whimsical stacked cabin looks like something out of a children's book.

An unnatural lake in a naturally beautiful setting.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This small primate research island is teeming with playing, fighting wild monkeys.

This beach pool offers a spectacle of crashing waves, blue hues, and a historical lighthouse.

A natural swimming pool in the middle of the Carite Forest.

Archaeological sites and great food inside the island's largest mangrove forest.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

This lavish abode was once the home of the inventor of "Gorilla Pants."

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

This general store is a one-stop-shop for workers at the Prudhoe Bay oil field.

This saltwater swimming pool, which is the last of its kind in the United States, is slowly crumbling within sight of multiple high-end beachside hotels.

This black shoreline is made up of exploded lava particles.

A copy of the famous bus used during the filming of 'Into the Wild' is on display at an Alaska brewery.

Commemorating the lives of a renowned humorist and a famed aviator who died in a plane crash in northern Alaska.

A 30-mile-long glacially-carved canyon leads to a massive pair of glaciers.

Every summer, the Mendenhall River greenbelt comes alive with an explosion of magenta flowers.

In 1912, this idyllic Alaska landscape was blown apart in the largest volcanic eruption of the 20th century.

This 36-foot-tall bronze Lady Liberty holds a real flaming torch.