An ancient burial ground believed to have been used for ritual sacrifice.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Massive crater in central Oregon.

A volcanic landmark located on an Ice age lake bed.

Stay in an old lookout cabin atop Oregon's spectacular Winter Ridge.

A volcanic fissure over two miles long and up to 70 feet deep.

This spectacular fault escarpment, a popular hang-glider launch point, extends some 30 miles long and towers about 2,500 feet over the valley floors to the west.

This enchanting hill is home to fairy lore and a sinister local mystery.

The top of the holy mountain for the ancient Spartans looks like a pyramid—is it man-made or a natural phenomenon?

The large fjord lake is thought to be the home of "Ogopogo," a giant sea serpent.

This large artificial waterfall in Washington state was merely an incidental byproduct of a technological megaproject.

A former drinking water storage reservoir transformed into a sunken garden.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

Just off the city’s central station hides a quaint lamp-lit alley into medieval Elsinore.

This fine-dining restaurant features native New Zealand ingredients and Māori cooking.

A winding staircase that appears to lead to nowhere is actually a diving platform into the Wellington Harbour.

Anyone wanting to know what a dwarven mine sounds like need only visit the tunnels of this New Zealand artillery compound.

The world's first fully-fenced urban ecosanctuary is a haven for New Zealand's rare and endangered species.

The alleged vampires after which these islets are named may have actually been plague victims.

Crystal clear, drinkable mountain spring water by the side of the road.

The oldest city park in Walla Walla is home to hundreds of birds, from wood ducks to white peacocks.

One of the iconic moai of Rapa Nui stands guard in Lyall Bay as a symbol of the friendship between New Zealand and Chile.

Tubing through a cave lit with glowworms is a magical underground experience.

A deserted island in southwest Japan that once sheltered persecuted Christians.