The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Roman ruins top white travertine terraces formed by ancient hot springs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This California estate was either haunted by ghosts or the Marx brothers.

The cobbled together compound of a deceased artist which now serves as a filming location.

This symbol of peace is appropriately positioned overlooking the Pacific Ocean.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

A macabre tour of Hollywood’s deadly history.

The final resting place of a space program monolith, soon to be unveiled again to the public.

World-famous, Pink's still manages to keep its prized cult fetish status.

In a city filled with Frank Gehry buildings, one stands out as one of the architect's weirder works.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.