This set of concrete chambers resonates according to different notes of octaves.

This striking memorial is one of Estonia’s most controversial Soviet leftovers.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

This atmospheric spot in Pärnu's historic old town is located in a 17th-century almshouse.

Legend says lovers who hold hands while venturing along this stone jetty and kiss at the end will remain together forever.

This abandoned beacon is moving closer and closer to the sea.

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

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

This controversial statue once honoured a Russian Field Marshall, before ultimately being dismantled in a push to remove symbols of Russian influence.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

There are hidden patterns on the subway seats of some Stockholm metro cars.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

Spend your honeymoon where the Devil had his wedding.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

A statue of the heroic plumber stands outside a company that bluffed its way into being Nintendo’s Scandinavian distributor.

A meow-velous tribute to a beloved street cat, made famous on the internet.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

Large miniature theme park with 100-plus models.

This shuttered power plant is now Turkey's first industrial archaeology museum.

It's believed that this small church was connected to the Hagia Sophia via a secret tunnel.

Climb a set of vertiginous stone steps to the top of this impressive ancient edifice.

Step back in time and witness the fall of Constantinople.