An Italian hillside ghost town.

Cliffside houses provide a spectacular view from their perch above the valley.

Village situated on a narrow volcanic escarpment.

A Spanish town built into the cliffs.

These quaint French houses dangle precariously over a precipice.

In this truly magical place, rent hasn't been raised since the year 1520.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

The world's largest collection of intentionally useless inventions.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

Despite the ever pressing encroachment of urban sprawl this grand New Orleans manse still stands.

The longest hedge maze in the world.

Double spiral staircases are not unheard of, but they are very rare.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

On the Oregon coast there is a natural hole that seems to be draining the sea.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Houses are tucked between, on, and underneath giant boulders.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A stairway to heaven, or to nowhere at all.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

Two small chapels housed inside an ancient tree.