There are two dozen tanks just sitting in an open field in Lower Saxony.

Moscow's other, lesser known kremlin is a fairytale-like cultural complex modeled after Old Russia.

The latest in a series of long glass bridges suspended at terrifying heights.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.

Climb to the top of this windmill for a scenic panorama and up-close look at wind energy production.

A striking 12th-century-style castle built on the edge of a cliff.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This peculiar border irregularity is the only way to legally enter Russia without a visa.

The place to be if you love vintage Swedish cars.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

An alchemist's "magic door" stands in the middle of a Roman park.

An Italian vineyard invites religious pilgrims to stop by 24/7 to get their drink on, for free.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

Largest cave system in Africa.

Only through deep darkness and tragedy did this elaborate royal palace become a sacred temple.

This former military airfield's claim to fame came from a lucky accident during the Second World War.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A spectacular annual festival centers around humans throwing molten iron against a wall at night.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

This unattributed sculpture in Amsterdam is hiding in plain sight.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

The world's oldest individual clonal tree looks like a wimp despite standing tall for 9,550 years.