Ancient Greek oracle of the dead.

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

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

A gigantic statue of a Russian soldier watches over the ancient city of Plovdiv, a prominent reminder of the Soviet period in Bulgaria.

One of the largest mines in Bulgaria is now home to a vast museum more than 100 feet underground.

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

A striking symbol of the Bulgarian capital.

This black church sits alone among a field of lava rock.

Three columns of volcanic rock shoot out of the ocean.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

A little-visited waterfall in an otherworldly landscape.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

The oldest church in Iceland is one of the few to feature ornate decoration.

This elegant arc of a waterfall marks a religious turning point.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

The most powerful waterfall in all of Europe.

The hallucinogenic center of the ancient world.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

A museum and shop on Bourbon Street located in the French Quarter.

Shop for books in the New Orleans house where William Faulkner once lived.

This little slice of the Netherlands in the Pacific Northwest blooms in a rainbow of color each spring.

The magic's in the hole!

Although it also features red, orange, and variegated cliffs of Navajo Sandstone, this state park is often overshadowed by its more famous neighbor.