A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Rocky Atlantic beach home to a stunning stone arch.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

Huge hole looks down onto an underground beach populated with sea lions.

This metal church may or may not have been designed by Alexandre-Gustave Eiffel.

This spot along the 23.5 degree north parallel marks the northern boundary of the tropics.

Experience life in one of America’s smallest neighborhoods.

Ten acres of the Kula Forest Reserve make up this wonderous state park.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

A cooled lava flow from the Haleakalā volcano formed these surreal-looking columnar basalt structures.

This unique formation appears as though an asteroid landed on the forest.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

An alien landscape of chalk-rock in the Egyptian desert.

A faux desert landscape in the middle of the jungle that sprouts oases during the rainy season.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Rusty pieces of metal jutting out of a breakwater are all that's visible of the 12,500-ton ocean liner that capsized just off the beach.

French prisoners carved these boats from the bones of their meat rations.

Julia Morgan's Moorish-Gothic labyrinth of fountains, trees, natural light and Oakland's notable dead.

Odd stone and concrete monuments in the "Poet of the Sierras" eclectic folly garden.