Belfast's namesake river still winds below the city center, hidden from sight.

The ship built to ferry passengers and goods to the doomed Titanic is now the last remaining White Star Line vessel.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

The granite head appears to be deep in thought and half buried in the ground.

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

With its webbed walls and bright red coloring, Calgary's iconic bridge looks like a finger trap puzzle stretched across the river.

This enormous photomural pays homage to Vancouver's infamous history of public activism.

A unique spiral staircase that doesn't quite make it up to the top floor.

A working steam clock, one of only a few in the world, located in Vancouver's Victorian Gastown.

Legendary frontman of the Doors looms in this giant mural by famed Venice muralist, Rip Cronk.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

The colorful, smiling concrete silos of Vancouver.

Two graffiti towers stand like ghosts of Vancouver's World War II-era defensive outpost.

Oldest building in California still in use.

This natural wonder is disappearing at an alarming rate.

A herd of colorfully painted bovine statues can be found in the middle of "cowtown."

Fossils, railroads, and waterfalls!

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

Three columns of volcanic rock shoot out of the ocean.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

The colonial city's social history is reflected in its fanciful door knockers.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.