The atomic museum in the basement of this German castle displays long strands of replica uranium cubes.

Despite the groans of archaeologists, this astounding groups of Bronze Age petroglyphs have been painted red for tourists.

A stunning architectural yet functional feat, towering over Oslo.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

This chimerical bridge/tunnel appears to dead end right into the sea.

Powerline dead since the 1980s despite appearances.

A series of haunting wooden totems are hidden in the woods surrounding a German environmental center.

Built to test magnetically levitated elevators, the tower also boasts Germany's highest visitor platform.

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

Freddie Mercury's childhood home is now a monument to the iconic Queen rockstar.

In Zanzibar, a historic 19th-century palace is a reminder of the world's shortest war.

This slowly crumbling mansion was home to one of East Africa's richest and most powerful slave traders.

This monument is a stark reminder of the horrors of the Zanzibar slave trade.

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

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

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

A fascinating insight into daily life in the Eastern Bloc.

Berlin's old airport.

A stairway to heaven, or to nowhere at all.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

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

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.