Metro station with a claim to rock n' roll fame.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

Tiny memorials honor individual victims of the Holocaust.

One of downtown Berlin's last reminders of its Communist past.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

The growing stones of Romania.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

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

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

Religious structure known for its sculpted details.

Petrified footprints of one of the very first vertebrates to walk on land.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

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

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

This Transylvanian church has changed its denomination four times.

Check out engineering marvels of the past at this unintentionally retrofuturist museum.

Romania's triumphal arch looks out over Bucharest.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

This bone-filled cave got its name after they found 140 bear skeletons inside.