These molds for fiberglass statues have formed an eerie, accidental sculpture park.

Vikings and Evangelicals have both had a hand in this replica medieval church.

This pebble beach is so beautiful that taking its rocks is against the law.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

The oldest certified bowling alley in the United States is in the basement of this century-old bar.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

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

The world's brightest bioluminescent bay.

This former sugarcane transport tunnel is now a portal to a lovely beach.

This former railroad bridge was named after the great river that once flowed below it.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

The location of Puerto Rico's first water bottling plant, thanks to a collaboration between Mother Nature and technology.

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.

This tiny home was originally a narrow alleyway.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

A mountain of conch shells created by centuries of fishermen.

Divers can encounter an abandoned warship encircled by a giant kraken submerged in the British Virgin Islands.

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

A city continually buried under the ash of a volcano that has been erupting for more than 15 years.

At first glance, little checkered structures on the hillside look like they house the living, not the dead.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.