Macabre astrological automaton clock dating to the late 1400s.

Hidden beneath the streets of London is a secret subway that only carried mail.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The royal seat of Henri Christophe, a formerly enslaved man who became Haiti's only king.

Once living up to its name as the grandest hotel in all of Africa, the Grande Hotel is now home to a community of squatters.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Take a cruise with no movement but plenty of style in this one-of-a-kind boat mall.

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

Its buzzing collection honors vibrator history.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

The world's first ice hotel is still one of the most elaborate and beautiful.

The fully functional, submerged Vanuatu Post Office is definitely one of a kind.

A city continually buried under the ash of a volcano that has been erupting for more than 15 years.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Empty since 1989, now falling into ruin.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

In paradise, feral pigs have claimed an island all to themselves.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.