This museum is a full-size replica of an original church constructed during the 13th-century.

An 18th-century viewpoint across the surrounding highlands.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

An intricately carved Viking church overlooks a glistening fjord.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

An otherworldly, fossil-rich cobble beach holds Viking graves, cairns, and other remains.

The home of Ireland's last leprechauns is officially protected by the European Union.

This mountain trail inspired Nietzsche to complete his magnum opus.

A winding medieval path was used by mourners to carry their dead to the nearest church.

A series of 33 stone markers maps an ancient 55-mile transportation route.

This sprawling building built in 1890 was one of Minnesota’s earliest and largest mental health facilities.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

Much of what constituted mid-century Liverpool now litters a beach outside of town.

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

Literally a million fascinating cartographic artifacts are held in this sprawling university collection.

This abandoned dream castle and its cemetery look out over the city that once inspired their creation.

An exercise in patience and imagination, where Mother Earth turned common stuff into precious hidden treasures.

This large Sitka spruce that appears to be floating in mid-air, has defied logic for years.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

The FBI's urban training course may have the highest fake crime rate in the world.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

This prehistoric sinkhole lured exclusively male mammoths to their death, much to the delight of science.