Museum dedicated to the terror regimes of Hungary.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

Once the home of a hermetic monk, this cave now houses a small church.

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

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

A fascinating insight into daily life in the Eastern Bloc.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

One of the largest underground systems runs under Canada's largest urban center.

This massive, ancient stone was disassembled and then put back together again.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

A bit of retro transportation flair preserved in the world's largest department store.

Visit the monolithic tomb of America's most famous general.

Elevated freight railway turned wildly successful urban park.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

A unique seaside cave where Aleister Crowley faked his own death.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Tucked in the back of this amazing antique store is an important piece of medical history.

This abandoned five-star hotel is now a five-star urban exploration destination.