A giant Troll lurks under one of Seattle's oldest bridges.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A church of bones, decorated with 40,000 human skeletons.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

An enormous, inside-out glass globe built in 1935.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

An exquisite tunnel of cascading flowers.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

World's largest collection of serial killer artwork and other macabre exhibits.

This extremely remote border crossing was closed to prevent smuggling and looting.

These ancient pecked images are among the oldest and best-preserved in Mongolia.

A nondescript dirt lot hides an intriguing center of shamanic healing.

History, geography, and shamanism meet in this eye-catching monument to the greatness of three empires.

A jagged silhouette of shamanistic stone heaps rises from the shore of this dazzling mile-high lake.

This spiritual landmark for practicers of Shamanism is drenched in milk and vodka and covered in blue scarves.

Mongolian Buddhists believe this monastery in the Gobi desert to be the center of the world's spiritual energy.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.