An art-filled botanical garden and former dyeworks hiding in plain sight.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

A total of 22 tiny bridges cross this canal of the Yvette River, forming a unique trail.

Shattered columns and Egyptian pyramids outside of Paris.

This massive sculptural work outside of Paris was four decades in the making—and it's still not quite complete.

Bits of architecture from a town destroyed in World War I now decorate this hotel garden.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

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

In the waters outside Helsinki, a tiny island once used as a military outpost now welcomes visitors.

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

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

Indents in the pavement are all that remain from a grisly death machine in Paris.

Ghosts of France's colonial past.

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

An alien church provides much needed silence in the midst of a Finland shopping center.

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

The fairy tale castle of the "fairy-tale king."

The footprint of a frustrated devil in Munich's Cathedral.

Among the ostentatious rococo ornamentation of this church, an image of death cuts the life-thread.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A fearsome dragon clings to a corner of Munich's city hall.

Go surfing on this urban wave, "hacked" by local surfers.

The unusually large seat sits atop the base of a ruined temple.