Oslo's historic toboggan run has been letting thrill seekers slide from train stop to train stop for over a century.

One thousand trees were planted in Norway to be used to print books a century from now.

Harlequin costumes, signed scripts, and armor-wearing puppets.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

Jesus' footprints and the first catacombs in the world.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

2300-year-old Roman road connecting the empire.

Hotel designed by indie graphics artists.

An old Danish political institution where members of government can grab a drink off the record.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Copenhagen's celebrated theme park and gardens.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

An enigmatic modern marker left next to a historic Roman site.

The final resting place of the poets Shelley and Keats.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Plaques on its facade commemorate the Tiber's most destructive deluges.