The forgotten tomb of the Peruvian rubber baron who was the inspiration for Werner Herzog's epic film "Fitzcarraldo."

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

A spooky spot along the road where things mysteriously seem to move uphill by themselves.

The falls were named for the mistaken idea that they were the ones pictured on the Canadian $5 bill.

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.

One of the few places in Portugal where the Celtic ritual of wearing large wooden masks is still practiced.

The sacred shrine of the Yazidis.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

Locals dubbed it the "Owl Building" because of its bird-like appearance.

The largest radio telescope in the world searches for extraterrestrial life from the remote limestone peaks of southern China.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

The now-abandoned Fascist summer colony served a dark purpose during World War II.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

A mysterious ancient network of thousands of perfectly straight lines stretching across miles of Bolivian desert.

Was there a small "backpack nuke" hidden in the attic? JFK apparently thought so.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

Beautiful antiques and obscure engineering artifacts trace the evolution of phones from rare luxuries to ubiquitous.

The site of the Wellington avalanche, one of the America's worst railroad disasters.

One North Dakota man's vast collection of rare rocks, polished orbs, and geological wonders.