The largest stone circle in Ireland.

This painting of a beloved dog will be on display at the Scottish National Gallery at long as the museum exists.

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

This statue of the famed author, actor, and journalist is made entirely of screw-nuts.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

This ice cream parlor serves scoops of flavors like rakia, medlar, and poppy seed.

The lasting remains of a bygone era of open-air meat markets.

Live out your childhood construction fantasies in this one-of-a-kind gyrating hotel.

A curious cave church carved into the face of a cliff.

A curious little museum dedicated to the furry feline in the cat haven that is Old Town Kotor.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

This virtually windowless mass of smooth concrete is the only Catholic church in the city.

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

A pair of connected skyscrapers form this symbolic gateway.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A Serbian church lit by chandeliers made of weapons.

The unusual sculptures are believed to be powerful political symbols.

A misnamed well, with a deep dark past.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A museum dedicated to the former country.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

Believed to be the former location of one of the earliest Viking assemblies in Europe.