The first tunnel to be dug beneath a river, repurposed as an art and museum space.

This former coal gasification plant found a curious second life as a popular public park.

On a remote island, legend has it that a fiddler and his wife were turned to stone.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The 5,000-year-old megalith is believed to be Scotland's tallest standing stone.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

A trio of giant megalithic stones in the middle of a golf course.

More stones than Stonehenge, all scattered within a windswept landscape sure to enchant 'Outlander' fans.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

A market built atop boats is one of the few floating holiday markets in Europe.

The site where one of the most famous poems of World War I was composed is preserved to honor the legacy of the work.

In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

Stocking up on the world's best beer requires a pilgrimage to a monastery drive-through.

This natural history museum houses one of the world's largest rat kings, a terrifying jumble of tangled rodents.

To enter this cluttered-yet-cozy sanctum of Belgian brews, ring the bell and tell the gatekeepers you've come “to taste beer.”

A Buddhist theme park brings you a Buddhist version of Hell.

A quiet patch of astroturf laid out between a building that seems to be splitting in half.

The first Catholic church in Singapore is a Neo-Gothic colossus with a rich architectural history.

A gorgeous gilded tower houses what may be the world's largest collection of gin.

Former self-sufficient mental institution now a planned community.

These sprawling mines once served as a source of plaster and today serve as a storage facility.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

The murals have transformed a residential alley into a vibrant drive-through gallery.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.