A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Home of a 28-foot tall stalagmite known as the War Club.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

The largest and most famous wax anatomical collection anywhere in the world.

Secret refuge and museum of the Duke of Florence.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The oldest operating pharmacy in the world features 800-year-old recipes.

The middle finger of modernity.

This demon atop the Notre-Dame de Paris looks utterly bored.

Less a museum than a bizarre fantasy world created by artists and engineers.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

The legacy of baseball great Roberto Clemente is preserved in a retired Pittsburgh fire station.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

If astronomy had a ghost, it would look like this observatory.

One-layer pyramid in Indiana.

Roses and other fascinating flora fill this garden built to commemorate Britain's immortal Bard.

You thought Santa Claus didn't exist, but it turns out you were wrong.

The world's largest collection of mechanical puzzles is a cornucopia of analog bafflers.