The largest cave in Northern Europe.

A naturally occurring tunnel in this Nordic mountain makes it look like it's been shot.

One of the largest mechanical models of the solar system in the world.

The world's largest model of our planetary system.

The world's third-largest scale model of the planets.

The telescope that discovered Neptune.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

In this scale model, our neighboring planets are represented by metal spheres spread across an English village. The nearest stars are represented by spheres in California and Australia.

This functional solar system model was inspired by the famous Eisinga Planetarium.

Pluto is still considered a planet in Ithaca, New York.

Tiny historical streetcars wind through a small scale version of Crescent City in this whimsical train garden.

This roadside attraction in the woods of Mississippi is a scalable replica of the Holy Lands during biblical times.

This historic train station has been converted to a locomotive themed hotel.

Statue of death tucked in the University of Medicine courtyard.

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

The oldest continuously operating mint in the world that has been making coins since the 9th-century.

The oldest stone house in Paris was built by its most famous alchemist.

A mechanized clock where a man fights off a dragon, crab, and rooster.

The heaviest gold coin ever minted.

The site where two doves fell in love.

The very center of Paris is surrounded by a bevy of strange good luck rituals.