Once a safe haven for locals engaged in blood feuds, this 400-year-old fortified tower is now a museum showing what life was like for those lying in wait within its walls.

A curious cave church carved into the face of a cliff.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Baroque celebration of the end of the Great Plague of Vienna.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

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

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

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

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

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

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

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

Georgia's answer to Easter Island immortalizes the nation's great poets, artists, and leaders in stone glory.

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

This architecturally eclectic fortress witnessed centuries of bloody turmoil, including the massacre of its ruling clan.

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

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

A man throwing a giant severed hand towers over Antwerp’s main square.

This ancient market is often referred to as the oldest shopping mall in the world.

According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

This church is dedicated to the patron saint of seafarers.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

Step inside an ancient beehive tomb built for a mysterious cult hero.