This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

A hidden alley in urban Baltimore is a haven for graffiti artists.

The site of Paul Revere's historic two lantern warning.

This headstone marks the grave of an 11-year-old boy killed during clashes in the streets over the boycotting of British goods.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

Amsterdam's Red Light District leaves little to the imagination.

An epic sculpture depicting a wagon and straining oxen.

The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

Medicinal spa created with the discharge from a geothermal energy plant.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Climb right into the heart of this colorful Iceland volcano.

This stunning concert hall has become a symbol of Iceland's national recovery.

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.