An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

This 5,000-year-old tomb once had its own hinged door.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A lavish Victorian mansion wound up inheriting a gruesome reputation that would be its demise.

This hidden bridge is where local children leave gifts and messages for the island's fay folk.

Nestled atop a wind-swept crag in the Scottish Highlands is a lonely memorial to a beloved hiker.

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

An abandoned, desolate train tunnel that was used during World War II.

This cemetery features modernist statues as strange as its name.

A lovely look back at the manufacture and use of paper in all its forms.

This pub built its reputation pouring post-shift pints for employees of the cemetery with which it shares a wall.

Admire endangered plants in a verdant garden that looks straight out of a Monet painting.

The marshy karst plain has reclaimed this beautiful 17th-century church.

This towering church is home to a world-famous organ and a treasure trove of medieval art.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

An astounding collection of taxidermy, fossils, skeletons, and even a few strange live beasts.

This pair of running lions engraved on animal bone is one of the earliest artistic depictions of big cats.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

A little-known ruin with a convoluted history and a fascinating latrine drainage system.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Fragments of human bones are embedded in the walls of this quaint alley.