The enormous isokinetic structure hangs within a science center in Estonia.

Troublesome students were detained in this tiny graffiti-covered university jail.

Historic slum of Tartu.

The labyrinthine home of the National Archives of Estonia is an experimental blend of architecture, art, and history.

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

First point in the Struve Geodetic Arc, a 19th century undertaking to measure the Earth's size and shape.

Take a seat and hear a song by the composer Frédéric Chopin.

The first monument in Estonia that was made by an Estonian sculptor.

This 16th-century cemetery became a recreational park during the Soviet occupation—today it's a little bit of both.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

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

A series of concentric circles represented a bold new experiment in socialist urban planning, and it notoriously difficult to get around.

A forest park outside Tallinn full of architectural and artistic curiosities.

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

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

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

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

An underground nightclub helped spark a "Singing Revolution."

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

The reconstruction of this prominent building fulfilled a long-written command.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.