This niche museum devoted to ancient religious artifacts is shaped like the very thing it displays.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

The world's second largest single-dish radio telescope, once used to contact E.T.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

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

The world's brightest bioluminescent bay.

Millions of glowing microscopic organisms light up the waters of this luminous lagoon.

Nature took her revenge on the "Wickedest City in the World."

Cavernous opening completely encased in Karst limestone.

The subtle interplay of fire and water is hard to ignore at this remote Jamaican spring.

The legend associated with these ruins understates the splendor of the mansion that once stood here.

Amazing meticulous gardens of personal wood carvings, Hydrangea, Canna, and many other flowers.

A man-made island in scenic San Francisco Bay.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

Half of a house.

The restored and active Victorian-era final resting place of San Francisco.

Golden Gate Park's historic collection of plants.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.