Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

The Grand Canyon of Texas.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A modernist landscape of water and sci-fi concrete.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

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

This impressive Boston holy house is the American mecca for Christian scientists.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

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

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

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

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

A museum wholly devoted to juvenescence.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A Roman spa buried deep beneath the City of London.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.