This sacred, circular cave is lined with pools so clear and still that it's hard to tell where the water begins.

Sitting atop a rock on Michamvi Pingwe beach, this restaurant becomes its own island at high tide.

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

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

With over 10,000 lights, this engineering marvel lights up the city after dark.

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

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

A lively circle of dancers in the Georgian capital commemorates an ancient rite of spring.

When the Soviets destroyed the historic Armenian monastery they somehow left its bell tower intact.

You'll find just about anything in this funky Tbilisi flea market.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

One man's remarkable private collection of art from around the world.

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

An exquisite collection of fairytale conveyances that puts most car museums to shame.

Eat the ultimate iteration of Portugal's most beloved pastry.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A unique seaside cave where Aleister Crowley faked his own death.

One Portuguese poet described this cape, the westernmost point in mainland Europe, as "where the land ends and the sea begins."

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.