These precariously placed ruins harken back to a 13th-century castle.

Where condemned pirates met their grisly end at the gallows on the River Thames.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

The grand complex of buildings that comprise Liverpool's Exchange Flags includes a vast World War II bunker that has been frozen in time.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

This giant sculpture made of trash is a critique of society's wastefulness.

The second-longest pier in the U.K. stretches a whole kilometer into the Irish Sea.

This historic electric train has operated with regularity since the early 1900s.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

This haunting stone chasm is a hotbed of mossy rock and English legend.

This 20th-century replica of a 13th-century castle has itself fallen into ruin.

This bronze statue was dedicated to a 1966 Beatles hit.

This whimsical public art installation is a unique homage to Liverpool's industrial heritage.

Massive galleon from a box-office bomb docked in Genoa.

A contemporary art installation housed within a Gothic cathedral.

A holy well believed to have healing powers.

A little-known castle set in a nature reserve.

These haunting ruins belong to an ancient village that once had one hell of a view.

Pilgrimage site for star-crossed lovers.