The dome-shaped reservoir of this old water tower produces unique acoustic effects.

A monument to the "father of modern warfare" Gustav II Adolf.

The lake that fills and empties itself at random.

A miniature city, once ruled by the Queen of the Netherlands.

Oakland's beautiful monumental cemetery.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

This communist country can still appreciate its fragrant past.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

A memorial to a Swedish hockey player's "encounter" with aliens.

A restaurant and observation deck built in a unique broadcasting antenna.

David Sedaris called it "The greatest shop in the world."

Strange secondhand shop showcasing taxidermy and oddies

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

An astounding collection of medical specimens, including bits of President Lincoln.

A garden of flying flowers.

The topiary maze at the Habsburg hunting lodge.

Handsomely crafted representations of our round planet.

A 20th-century picture show in 3-D.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

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

The last moments of the ill-fated Pompeiians, frozen forever in plaster.