A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Hidden in the forest are the remains of a former World War II chemical plant.

It's said the devil used this mushroom rock as a table for a late-night meal.

This private museum is packed with 20th-century traffic and technology artifacts.

This mine is home to the largest man-made hole in Europe.

One of two electrical towers in Germany that have a pathway constructed through the tower's legs.

Deep in the forest next to Augsburg are abandoned bunkers and bullet traps from the region's military past.

This decommissioned nuclear power plant offers tours of its Communist-era control room and reactor hall.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

A surprisingly detailed model of one of the most powerful telescopes in the world.

This stone amphitheater was once part of Nazi Germany's plan to promote propaganda.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

An old tram depot transformed into a vintage car paradise.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

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

Retirement home for giant obsolete machines.

A former ironworks that was the first UNESCO industrial site.

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

This unique Renaissance castle was turned into a home for Nazi occultism.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.