Underwater roads undetectable from the surface used for escape routes from foreign invaders.

Sculpture garden of religious statues made it through Soviet rule.

The largest coin pyramid in the world is a carefully balanced stack of over 1,000,000 pieces.

This former KGB building is now a museum memorializing the people who suffered during the Soviet regime.

This micro-nation may be some sort of prank, but its constitution sure seems official.

This statue is dedicated to the animal cosmonauts that perished during space flight experiments.

The Latvian city of Ventspils is filled with dozens of cow statues showcasing unique themes.

This controversial monument was designed to lionize the Red Army, but also disheartened the Latvian people.

A preserved oak tree about 3,500 years old found in Riga, Latvia.

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

Legions of Roman soldiers bathed in this ancient spa complex under a Budapest transit station.

The heads of two giant mythological water horses honor Scotland's horselord past.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Ancient cliffs resembling a kilt on Scotland’s second-largest island emit an entrancing sound.

A naturally beautiful, seemingly bottomless deep blue spring.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

Gigantic water vessel, permanently grounded in Southern Albania.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Space-age monument to an early 20th-century uprising.

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

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

A marvel of Byzantine engineering under the streets of Istanbul.

An autonomous republic of Orthodox monks.