After Christopher Columbus died, his son built a fancy house to rule from.

Built in 1512, the oldest cathedral in the Americas.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

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

Louise Bourgeois' 30-foot-tall steel spider sculpture.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This natural wonder is disappearing at an alarming rate.

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

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

The large fjord lake is thought to be the home of "Ogopogo," a giant sea serpent.

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

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

Come for the flowers, stay for the bats!

A shiny sculpture celebrating the mighty mollusk.

A British plaque explains that a house was built using the spoils of the first international golf bet.

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

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

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

Aside from denoting a public square or market, this medieval structure was also a sign of a town's prosperity.

This unusual rock looks like a giant, otherworldly mushroom sprouting atop a cave.

A small Scottish town's larger-than-life tribute to the celebrated accordion player.

One of two Irish-style round towers in Scotland, this structure has mysterious origins.