One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

This museum tells the story of lake dwellers from 4000 BC to 850 BC, replete with stilt houses and goats.

Oddly shaped rock formation, misassociated with a nearby utopian community.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

The farthest you can be in the contiguous U.S. from a McDonald's location.

These lovely Turkish-styled baths were brought back to life after winning a reality show competition.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

On a dusty county road sit the ruins of a ghost town's abandoned church.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

This picturesque mansion has gone from opulent ruin to nature museum.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

Ozymandias’ time-keeping temple.

One of the most remote spots in America and the first protected wilderness area in Nevada, named after an old legend.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.