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

For years, the remains of this ancient Roman fortress were hidden under an orchard.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

Underground attraction offering tours of the foundational ruins of a church nave that collapsed in 1674.

Atop this former dutch railway office sits an interstellar work of art.

The cutest way to stay safe in traffic.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

A uniquely preserved neo-Gothic church that is now home to a collection of art and woodcarvings.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

The closest thing to Mars on Earth.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

The secular incarnation of a religious meditation.

A naturally beautiful, seemingly bottomless deep blue spring.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

This monument sits at the foot of a mountain from which legend says enslaved people jumped to their deaths.

The eccentric mansion of one the most popular horror authors of modern times.

This tiny patch of arid sand sits in one of the greenest states in the United States.

Caves full of Buddhist statues, incredible rock formations and a deserted lagoon.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

An unmarked, overgrown path through dense vegetation leads to the largest ancient structure in Polynesia.