Super-heavy Nazi architectural experiment.

Berlin's old airport.

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

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

Model Trains and Much More in Hamburg.

Hundreds of these oversized benches have been built as an art project meant to change people's perspectives.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

The largest salt lake in the Sahara is mysteriously alluring.

Founded in 670, this ancient mosque is an architectural time portal.

This grand hydraulic installation has provided water for townspeople since the Middle Ages.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This unassuming bookstore in the heart of Madrid is one of the oldest in Spain.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

Northern Ireland's Brobdingnagian stepping stones.

The father of Belfast medicine is buried in the graveyard of this 13th-century church, which now lies in ruins.

This village provides a glimpse at rural life in Northern Ireland during the mid-20th-century.

These engineering masterpieces are a dominant feature of the Belfast skyline.

A series of stained glass artworks that depict images of the hit TV show.

One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.

A museum marks and documents the site of the Titanic's launch.