Places ERuler39 Wants to Go

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

The last permanent exhibit dedicated to the Soviet leader.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

This lake-bound geographical marker sits at the point where three European countries intersect.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

This stoic bronze soldier stands as a symbol of Russian sacrifice or Soviet oppression, or maybe both.

Relics from an era long gone, sit idle outside this Estonian museum.

Wars fought and wars won are remembered by these abandoned bunker ruins.

The secret cells in the basement of the KGB's Estonian "Grey House" have been preserved as a grim Cold War museum.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

"There's nothing there," and other lies the KGB told us.

A crumbling World War I fort that is reached through a series of concrete tunnels.

This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

Island wonderland for communist autocrats.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

The only gulag ever to exist in socialist Yugoslavia.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Longest fortress system anywhere in Europe.