At the supposed instruction of Ben Franklin and Socrates, a Spiritualist believer intended to birth a mechanical messiah here.

A historic bridge with a lovely acoustic anomaly.

Solar powered Spectacle Island features all-green facilities.

Former villa and estate of James Deering developed to preserve native tropical forests.

This beautiful Miami garden was designed as a laboratory for tropical plants.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Microscopic scenes; some call it novelty, some call it art.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

The tunnel's elegant proportions keep you snug with no claustrophobia freak-out.

Macabre astrological automaton clock dating to the late 1400s.

Two stunning 17th-century libraries and a cabinet of curiosities.

A Jenga-style cylindrical tower of books that appears to go on forever.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

Museum devoted to the artificial language of Esperanto.

This cubist Vienna church building looks like some sort of alien stonehenge.

The Habsburgs' royal collections of art and wonders.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

The topiary maze at the Habsburg hunting lodge.

Handsomely crafted representations of our round planet.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

The beautiful baroque library of the Hapsburg empire.