Cycle the solar system—from the sun to Pluto—right here on earth.

Elaborate tile work in this railway station tells the story of Portugal.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This giant sculpture made of trash is a critique of society's wastefulness.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

A large collection of solar and night-time telescopes dot a small area on the Teide mountain range.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

Follow the original medieval paths that wind through this intriguing section of the city.

Though much of the castle was robbed of its stones, the underlying earthworks are among the best-preserved in England.

The largest preserved walking dragline excavator in Western Europe.

The haunting cadaver tomb of a famous French poet, playwright, and filmmaker.

Historic medieval fortified city in southwest France.

700 iron sculptures crammed into a Mediterranean park.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

A unique underground structure dating back to the 1st century BC.

This ancient theater was once the home of fierce gladiatorial battles.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Half a century after it was abandoned, this ghost town is coming back to life.

100-windowed castle turned art gallery, built by one dedicated mason.

This plaza is home to a number of works, including Montpellier‘s own Arc de Triomphe.