Founded in the 4th-century, the town of Pernik plays host to the Surva Carnival⁠—a magnificent display of masked Kukeri dancers.

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

"Holy Wisdom" overlooks the city that became its namesake.

A vast Communist-era exhibition space in the Bulgarian capital.

"Unity, Creativity, Beauty."

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A striking symbol of the Bulgarian capital.

A flamboyant five-story building in Bulgaria resembles a crawling snail.

A spectacular Bulgarian cave resembling a devil's head with a waterfall rushing down its throat.

This historic black and white monastery is one of Bulgaria's architectural jewels.

The world's second-tallest flagpole stands proud despite dropping rank.

A stunning blue-green lake located in the Terskey Alatau mountain range.

This beautifully restored fortification kept the city safe for centuries.

Nature's water park in the Wadi Bani Awf valley is full of pools flanked with cliffs and natural water slides.

Groups of prehistoric tombs that dot the mountains of northern Oman.

This bazaar is one of the oldest in the Arabian world.

This spectacular mosque houses the second-largest chandelier in the world.

This Soviet-era athletic and recreation facility is the highest ice skating rink in the world.

A modern tower, symbolizing the legend of a golden egg on top of the tree of life.

An entertainment center in a huge transparent tent.

Iconic pyramid from famed British architect Norman Foster designed to represent all of the world's religious faiths.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.