Despite having a dome made of papier-mâché this tiny observatory has survived for over a century.

A former ironworks that was the first UNESCO industrial site.

The oldest Roman lighthouse still in use.

What was once a unique system of urban elevators is turning into a mechanical ruin.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

This former stomping grounds of the most eminent astronomers of the early 20th century.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

This historic observatory contains the world's oldest refracting lens telescope.

A world-class observatory in the California desert.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

The world's second largest single-dish radio telescope, once used to contact E.T.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

The world's largest neutrino telescope searches for secrets of the universe at the South Pole.

Behemoth, cannon-like telescope operated by generations of Irish earls.

A neutrino detector built into the largest man-made underground cavity in the world.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.