On this Puerto Rican island, many abandoned naval ammunition bunkers sit open while a few have been padlocked by locals as personal storage.

The world's brightest bioluminescent bay.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Dozens of large, brightly-colored paintings adorn the walls of the "street art capital of Iceland."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

View the California coastline (and the home of Barbara Streisand) inch by inch with stunning, government-sanctioned aerial photography.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

An architect's childhood fantasy treehouse made real.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This rustic old building is said to be the most photographed barn in America.

Installed as a beacon of hope for a hurricane-racked island, the statue had to be moved multiple times due to the eroding coast.

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

These 11,000-year-old mounds may be the oldest known human-made structures in the Americas.

The LSU mascot lived on the college campus in one of the most impressive tiger habitats in the country.

This gallery dedicated to regional and emerging Black artists is housed in a historic building-turned-arts-hub.

This creepy, yet oddly beautiful cemetery is home to one of the founding fathers of Lake Charles.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This 19th-century museum inside of a lighthouse is only accessible during low tide.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

At the most northwestern point of the contiguous United States lies a trail leading through an ancient forest to stunning cliff-side vistas and massive oceanside caves.

This grove of ghostly cedars was killed in 1700 by an enormous tsunami, felt from the United States to Japan.