Step back in time and witness the fall of Constantinople.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A fountain standing as a testament to a doomed alliance.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

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

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

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

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

Mysterious standing stone formations looks like a petrified forest.

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

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

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

UNESCO-protected ancient burial ground.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

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

An abandoned saucer-shaped monument in the Bulgarian mountains.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

This imposing 20th-century castle was abandoned before it was ever completed.

The site of the first battle of World War II.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

This lonely Lithuanian chapel looks more beautiful and haunting in decline than it ever did in life.