This abandoned fighter jet launch center is now a haunting street racing course.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

Wars fought and wars won are remembered by these abandoned bunker ruins.

This Estonian watchtower looks like a big tree with two giant bird nests on it, complete with a "golden egg."

This old Estonian mine has been kept like a sprawling time capsule of the local shale industry.

Rusted cars, trucks, and buses form a fascinating collection of Soviet-era machinery.

First point in the Struve Geodetic Arc, a 19th century undertaking to measure the Earth's size and shape.

A historic scientific breakthrough that crosses nine borders.

Two well-hidden huts let animal lovers spend the night among the bears, wolves, and other predators of the forest.

A decommissioned submarine base makes a great space for graffiti art.

"There's nothing there," and other lies the KGB told us.

The widest natural waterfall in Estonia is a sight to see in all seasons.

A former imperial sea-fortress and Soviet prison.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

One of the oldest lighthouses in the world has been in continuous use since it was first built in 1531.

This small Estonian hill is covered in hand-made twig crosses that are said to bring good luck.

A wooden replica of France's famous tower.

Two old windmills got a new life as oversized sculptures of a man and a woman.

The world's most active stratovolcano is almost always erupting.

Morocco's Argania trees are infested with nut-hungry goats.

In this desolate valley resides a gorgeous set of rocks sporting a technicolor design.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.