A subterranean house of worship carved right out of the bedrock.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

A garden of flying flowers.

A tiny house showcases the busy life of a local gnome.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

Also known as Napoleon's Canal, this waterway was created on the orders of the general, and construction was interrupted by Waterloo.

The bronzed skull of a beheaded traitor was affixed to the city gate in the 17th century.

Christ's blood allegedly preserved in a Belgian town.

The oldest cemetery in Belgium.

The spectacular and eerie moss-covered grave site of 19th-century Belgian merchant.

Home to the world's oldest functioning orrery.

What was once a bustling mining installation is now a bustling hub of contemporary art.

Preserving the research tools, unexpected inventions, and odd collections of generations of college professors.

Hiding the longest subterranean river known in the world.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

An alien church provides much needed silence in the midst of a Finland shopping center.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

This memorial museum chronicles the apocalyptic destruction of the First World War.

A moving memorial to the fallen and missing from WWI trenches.

This Belgian theme park began as a refuge for bored church children and was closed down when a boy lost an arm.