This Stone Age solar temple aligns with the sun on each equinox and solstice.

Abandoned Roman Catholic chapel abused by Satanists before being restored.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

One of England's most famous churches hides a pair of little known architectural treasures.

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

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The ancient latrines of the Greeks, in all their public glory.

Countless grotesque faces stare out from this eerie Prague art wall.

Steadily reminding Czechia of its past.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

A mocking tribute to the past and modern leadership of Prague.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Hundreds of caves once used to store grains and animal feed.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.