A monument to the three wars that led to German unification towers within a Berlin traffic circle.

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

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.

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

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

Hear the quietest sound from across the dome.

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

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

A fascinating insight into daily life in the Eastern Bloc.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

An early 20th-century bullring converted into a modern shopping center.

Small Easter eggs are hidden in the ventilation holes of the city's newest trains.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Every year, a sparkling cave is sculpted in the icy heart of a glacier.