'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

The location of the world's first telescope demonstration.

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

This church also serves as a lighthouse complete with a beacon.

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

The Guardian of Tallinn.

This park built on a former fortress has a reputation for romance.

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

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

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

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.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

Giant topiary dog once played a role in a terrorist bomb plot.

A forgotten underground railway once whooshed trams beneath London.

One of London's lost rivers runs through a pipe over the tracks of this subway station.

The ground on which Shakespeare’s initial playhouse once stood.

Historic church where a number of Shakespeare's actors are buried.

The medieval woodcut-style artwork chronicles life in medieval London.