A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Famously misunderstood wonder of the ancient world

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A toxic ghost town sitting atop a massive coal fire.

This piece of Australian modern art is part joke and part history.

A youth-centric science center hides an industrial triumph.

For a century, the tallest building in Tasmania was a tower built to manufacture ammunition.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

This historic observatory contains the world's oldest refracting lens telescope.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.

One English town's celebratory landmark spurred more trouble than anticipated.

Henry VIII's forgotten castle was built by the gunpowder-obsessed king to be defended solely by cannons.

A circle stone within a stone circle.

Perhaps the only prehistoric monument with its very own public bus stop.

A living time capsule of the 1960s Richardson Bay water-front.

Concrete strongholds stand guard over the Golden Gate.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

A New Zealand communications tower stands as the tallest structure in the Southern Hemisphere.

Handcrafted thermal spa washes away each night with the tide.

The explorer Captain Cook may have named it White Island, but the Maori call it Te Puia o Whakaari – The Dramatic Volcano.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.