The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

The world's oldest known salt mine.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

The telescope that discovered Neptune.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

A delightful but little-known public observatory and planetarium in Munich.

An abandoned train station in Munich constructed for the 1972 Olympic games.

King Ludwig I's collection of beautiful women.

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

Model Trains and Much More in Hamburg.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

The prototype for all Nazi concentration camps.

The fairy tale castle of the "fairy-tale king."

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.

A remarkable two-country morph, this town is part of Germany legally but is by all other measures Swiss.

Albert Einstein's head sticks out of a snail shell stacked on a rocket in this truly bizarre monument to the scientist.

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

A meteorite-bounded town in Bavaria.

It's good luck to be mocked by this monkey.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

World's largest barrel containing an inn.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

A famed artist's inspiring work of peace and tolerance.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.