The first archaeological site discovered by aerial photography.

The oldest working mechanical clock in the world.

A giant sculpture of the legendary "Salmon of Knowledge" celebrates the return of fish to Belfast's River Lagan.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

Nestled near the mountains of western Canada resides this behemoth earth mover.

Fossils, railroads, and waterfalls!

Decorated by local artists, the city's utility boxes have become three-dimensional canvases.

Not for the faint of heart, this long pedestrian bridge rewards those who brave the wobbly walk with a beautiful view.

This First Nations monument is a peaceful spot with vast views of the Calgary prairie.

Despite being dead since the 1970s, this Canadian tree is kept upright and intact by adoring locals.

A sleepy little town that had the greatest landslide in North American history fall on it.

Historic site where Native American hunters once trapped and killed buffalo.

This natural wonder is disappearing at an alarming rate.

As if T-rex wasn't big enough, this Canadian monument is four times larger than the real thing.

This massive and unusual rock formation near Okotoks is the world's largest known glacial erratic.

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

Few other hotels can rival the grandeur of the Castle in the Rockies.

This Bronze Age burial mound used to be called "Robin Hood’s Piss-Pot" until it was renamed by spoilsport Victorians.

The English town of Mansfield likely got its name from this enigmatic breast-shaped mound rising abruptly from the earth.

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.