The second-deepest known cave on Earth, hidden in an extremely remote mountain region.

Nazca pilgrimage site covering 370 acres is a popular stop for archeologists and looters.

A Boeing mechanic and his wife leave a whimsical, stone sculptured garden as their legacy.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

An alchemist's "magic door" stands in the middle of a Roman park.

A store that sells all manner of bones, insects, and animal curiosities.

The Uros people live on floating reed islands in lake Titicaca.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

The place where houses are born.

Largest magic museum in the United States with more than half a million pieces of memorabilia.

A curious whirlpool formation supposedly capable of entangling or engulfing branches, tree trunks, or whole rafts full of hapless tourists.

A historic chapel filled with colorful murals and a colorful past.

What is left of the pillar of Saint Simeon, the voluntary martyr who climbed the column to give his sermons, remaining perched there for thirty-seven years.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Come stay at a live-in art installation.

A shrine on the shores of the Tigris.

Fountain where visitors can earn a license to be mad.

Southern Mexico under the influence of mushrooms, ceremony and celebrity.

Myanmar's Mount Olympus atop a 2,500-foot volcanic plug.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Miraculous vase predicts the future at this Tibetan Buddhist site in the Himalayas.

A cemetery with goat-horn bedecked gravestones.