Avenue of trees planted by cosmonauts before their space departures.

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

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

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

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

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

A gigantic collection of teeny, tiny books.

Mysterious hillside with a continuously burning natural fire.

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

Unusual building appears to be haphazardly built from randomly piled bricks.

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

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

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

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

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

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

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

Hidden up a dusty track off the Georgian Military Road is this fascinating waterfall with mountainous views.

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

Ruins of a former government building destroyed during the Georgian-Abkhaz war in the wake of the fall of the Soviet Union.

A beautiful but deteriorating monument of Soviet architecture.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

There are thousands of tributes and memorials to the King, but none quite like this one in a Kraków city park.

An ethereal glowing blue ocean cave in Croatia.