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

Hundreds of signs pointing to the birthplaces of current Helsinki residents form stalactites on the ceiling of the cave-like Kamppi metro station.

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

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

The church's remarkable frescoes incorporate Finnish artist Hugh Simberg's trademark themes of death and the supernatural.

Dedicated to the outnumbered Finnish forces who pushed back Soviet forces during the conflict.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

An abstract monument to a symphonic composer.

Another entry into the world of Edinburgh's pop-up artworks.

The 20th-century chapel’s intricate woodwork includes amazing details, most notably angels playing bagpipes.

Neon artworks light up this dark Edinburgh tunnel.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

A small museum that celebrates the history and culture of the LGBTQ community in England.

The Great Fire of London and the regulation of one-way streets both started in this alley.

Above an abandoned Underground station, this charming bookstore is home to strange antiquities and literary works.

This ancient Egyptian obelisk still bears the wounds of World War I.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

The Tudor-style cottage in the middle of the square is not quite what it seems.

An architectural oddity hides in plain sight on this iconic London bridge.

The remains of the great moral philosopher reside in a university in London.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The cedar tree in Highgate Cemetery earned its title by accident.