Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

This legendary city has been a tourist attraction for centuries.

Monasteries on rock pillars, once accessible only by frayed ropes.

The hallucinogenic center of the ancient world.

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

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

The Greek War of Independence was declared at this medieval Byzantine sanctuary.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

The nuns here cultivate silk to weave some of the finest scarves in the world.

Graffiti-covered ruins of a luxurious resort sit among enchanting beaches.

The home of half the world's population of critically endangered mountain gorillas.

Where the White Nile River dramatically cascades between Lake Kyoga and Lake Albert in Uganda.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.