One of the world's steepest streets seems to have houses sliding down it.

Over two million dolls have been healed during this hospital's century in business.

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

Recovered from the brink of extinction, at home in the Financial District.

Faceless white figures loom over the city from the rooftop.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

This electric green sulphur lake in New Zealand looks like a cartoonish radioactive dump site.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

The tomb of one of Scotland's bloody historic villains is a magnet for bumbling desecrators.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

Once housing children next to hardened criminals this historic jail once displayed Ned Kelly's skull until it was stolen.

Ancient snack bar of the Roman Empire re-opened.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Pilgrimage site for star-crossed lovers.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Floating man-made island and upscale restaurant.

This private residence was the template for one of the most beloved television homes of all time.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A dilapidated dock tells the story of Titanic's missed arrival.

A popular European tradition makes its way to the states on one of America's most famous bridges.

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

One of the largest underground systems runs under Canada's largest urban center.

Soaring over the Niagara Whirlpool since 1916.