An abandoned Byzantine fortress and notorious prison.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

An unexpected ghost village lurks on the southeast coast of Tenerife.

A massive collection of petroglyphs dating back some 40,000 years.

The village's cobblestone streets are lined with shops displaying exquisite copper craftsmanship.

What might be the largest completely Jewish town in the world outside of Israel now faces dwindling numbers and empty streets.

Azerbaijani ghost town, decaying after a war left it an armed forces buffer zone.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

A quirky house created entirely out of glass bottles combines a collector's spirit with an artist's flair.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

A unique museum dedicated to culture and artistry of carpet weaving.

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

A shrine of fire worship built on top of a natural flame.

Mysterious hillside with a continuously burning natural fire.

A place steeped in history that may be best known as the set of a 1960 film.

These rose marble urinals are the most luxurious loos in Liverpool.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

Rock carving created 1,300 years ago 75 feet off the ground.

The Bulgarian royal family exclusively used this ornate, now-abandoned train station.

Walk through history in a palace that has seen centuries of Muslim rulers.

The most remote tree in the world survived desertification, but not a drunk truck driver.

These ancient giraffes are the largest known animal petroglyphs in the world.

The tallest mud-brick structure in the world has been standing since the 1500s.