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.

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

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

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

The oldest continuously operating pharmacy in Europe.

A medieval setting reimagined into a unique art alley.

The Guardian of Tallinn.

A unique sculpture calls the outside of this steakhouse home.

This contemplative sculpture made out of old machine parts is meant to be the first in a series of sculptures around the world.

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

Atop this electronic store resides a massive fighter jet.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

The tiny, studious rodents greet visitors to the National Archives of Finland.

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

A subterranean house of worship carved right out of the bedrock.

An abstract monument to a symphonic composer.

This ten-ton fruit sculpture celebrates the Finland homeland.

The sole surviving large cairn in an area that was once littered with burial monuments.

The ruins of a 15th-century castle that has seen its fair share of bitter feuds.

This massive, 30-foot-tall statue of the famed Scottish knight overlooks a grassy knoll.

Considered "the most original, complete, and unimproved" circles in Aberdeenshire.

From fortification to folly, this hilltop structure has undergone many changes in the last 800 years.