Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

A memorial to the soldiers who died in the bloody battles to control Verdun in World War I.

Historic medieval fortified city in southwest France.

The world's largest solar furnace uses 10,000 mirrors to concentrate the sun's rays to generate power.

Natural mummies hidden in the crypt of a medieval French church.

A Gothic cathedral created from volcanic rocks.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

American soldiers discovered Europe's best one-liner at the end of World War II.

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.