Model Trains and Much More in Hamburg.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

Hamburgers are intensely proud of their tunnel beneath the river.

Cold war icon and onetime "hole" in the iron curtain.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

The "Prussian Versailles" that is as glorious today as when it was built.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A restaurant and observation deck built in a unique broadcasting antenna.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

Certain traditions prevail on the least-visited island of the Aran Islands.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

The walls and streets of the ancient city are peppered with penises.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This legendary giant, born from vegetables, terrorized townspeople and cheated local children in games.

In the shadow of a former battleground, the resting place for nearly 2,000 soldiers who died in World War I.