Places radon Wants to Go

When struck, the strange stones in this park ring like bells.

The stately remains of Llywelyn the Great's mighty fortress.

Europe's largest prehistoric mound – burial site of a legendary king?

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

This pink watchtower served as the seat of the Greek government after independence from the Turks.

Japan's first automaton went missing, only to be revived by the Osaka Science Museum.

This unusual rock looks like a giant, otherworldly mushroom sprouting atop a cave.

There's a labyrinth of medieval chambers hidden deep below a 15th-century pub.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Two thousand artifacts from around the world collected by one woman who loved to travel.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

Are these prehistoric metal pipes evidence of alien plumbers? Nope, but they are amazing nonetheless.

The collection of ceremonial and cultural objects spans many countries and hundreds of years.

Over 60 species of birds inhabit this colorful aviary park in South Africa.

This allegedly haunted 16th-century tower house-turned-museum exhibits thousands of spectacular objects.

After years of slow decline, a derelict Gothic castle is now being restored to life.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

This charming, medieval walled village is Spain's first "book town."

A magnificent, long-abandoned castle built in the wake of the reconquest of Spain.

Real bones which are said to have belonged to a Polish dragon.

This ethereal, rainforest-like gorge is home to waterfalls, quaint bridges, and fairy folk.