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

Because sometimes you need to make a batch of frites even when the stores are all closed.

This abandoned Belgian fortress is purposefully being left to nature.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

France's highest manned weather station is the only one still inhabited by meteorologists.

A 19th-century mansion houses the largest collection of gin in the European Union.

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Abandoned Nazi train station turned underground astroparticle laboratory.

This century-old ruined temple was reborn as "The Church of Skate."

An abandoned Indian-inspired mansion.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

A landscape decorated with enormous skull sculptures.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

An out-of-place grove of sequoias thrives in northern Spain.

Giant topiary dog once played a role in a terrorist bomb plot.

One artist's collection of homemade handicrafts doubles as a monument to 20th-century material culture.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

An alien landscape of chalk-rock in the Egyptian desert.

Brightly painted boulders scattered throughout the Sinai Desert.

Dive for drinks at Croatia's first and only underwater winery.

Yugoslavia's biggest underground airport lies in ruins.