These cascading falls resonate throughout the Bulgarian forest.

A massive cave once a secret military base is now home to thousands of bats.

A Soviet-style monument, built after transferring the remains of heroes from their graves.

A decaying, yet still functioning, work of communist architecture.

An homage to the medieval rulers of Bulgaria.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

An abandoned saucer-shaped monument in the Bulgarian mountains.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

A scattered trail of street art adds a pop of color to the city's stark structures.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

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

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

Famous landmarks and structures from across Italy fill this miniature park.

The most loyal of little dogs, or a Victorian era publicity stunt?

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

On this stunning Scottish island, you can walk in the footsteps of dinosaurs.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

A close look reveals that the Scottish monument is just slightly off-kilter.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

This enchanting hill is home to fairy lore and a sinister local mystery.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

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

This stone tower was built to protect Crete from incoming pirates.