Friction between grains of sand cause a curious "singing" sound.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

The haunting ruins of Jack London's dream house.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

An Italian hillside ghost town.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

The largest greenhouse in the world is home to over one million types of plants.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

Half of a waterfall goes into the river while the other half seems to disappear.

Visit this playground of waterfalls, caves and sinkholes.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

Edgar Allan Poe's old dorm is now a shrine to the author's legacy.

Stay in a room with a view... of the bottom of the ocean.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.