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

Floating swimming pool within a moored vessel.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The world's largest model of our planetary system.

It houses the remains of a 17th-century version of the Titanic.

The mouldering manses of wealthy colonials still pock the streets of a Curaçao neighborhood.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

This tiny tropical village was sick of anonymity so the locals made this sign, which actually changed the name of the town.