A hidden three-foot-wide house separates these two regal churches.

A wall within the institution displays the names of 13,000 Jews who took refuge in the city during World War II.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

To enter the lower hall of this temple, you must first walk through a dragon.

Neglected resting place of some of the city's early luminaries—and a woman encased in concrete.

A sliver of 19th-century Germany sits on the shore of a Chilean lake.

This 19th-century ranch is being transformed into a residential library with thousands of books about the natural world.

The first newspaper printed by an expeditionary force was published in this colonial mansion.

An electrifying collection of gadgets and literature from the 16th through 20th centuries.

A shrine to the missionary who first brought Islam to China.

An off-the-beaten-path place to literally hang beneath Milwaukee's Holton Street Bridge.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.

When waves crash onto this section of beach, the rocks sing a song.

A tiny collection of traditional Japanese woodblock prints, open only when the owner feels like it.

Images of neighbors past and present guard the streets of this charming alpine village.

A careful eye can find hundreds of dinosaur tracks running along the Connecticut River.

For nearly a year, General Ulysses S. Grant was based here during the American Civil War.

Every birth, death, and marriage is recorded in these color-coded leather-bound books.

A secluded natural oasis hidden deep along a rainforest trail.

During World War II the Thorp building was guarded by the OSS, FBI, and US Navy because of the top-secret bombsight being produced there.

A 600-year-old mini shrine guarded by a sword-wielding knight hides in a crumbling cliff face.

A mausoleum dedicated to a warrior felled by misplaced loyalty and tragic circumstances.

Beautifully carved tombstones fill this unmarked graveyard, uniquely situated near the village's famous stone wine cellars.