Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Fortified homes of highland warriors that are still in use today.

Small church on top of a huge rock column.

Ancient rock-hewn town that witnessed key events of Georgian history.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

The fairy tale castle of the "fairy-tale king."

The prototype for all Nazi concentration camps.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Locals spent years successfully fighting to save this beloved Brutalist behemoth from demolition.

Locals call it the "Give Peas a Chance" bridge because of its distinct graffiti.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

A geological oddity topped with a 2,000-year-old pagan temple.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

A friendly pub with a sordid past in cock fighting.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

The remains of Alfred Nobel's first nitroglycerine factory can still be found on the shores of a Swedish bay.

No one knows who's responsible for decorating this tunnel with stuffed animals, but the people love it enough to protest their removal.