This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Limestone caves with spectacular showcase chambers.

A reproduction of earth's many biomes.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This impressive working clock made of 16,000 plants changes its flowers twice a year.

This Canadian city is actually two-in-one, even if they only respect the timezone of one side.

Possibly the world's largest coin stands just outside of a Canadian science center.

This towering totem holds the title for the tallest in the world but only according to some.

A massive Montreal stadium that has seen nothing but trouble since its inception.

Lake within a lake.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

Underground tunnels once home to crime are now back open to the public.

This oddly named town refuses to change its phallic moniker.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

This natural wonder is disappearing at an alarming rate.

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

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

The third version of this tall sailing ship sits, rusted and burnt, in Lake Ontario.

Roadside collection of 65,000 signs.

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

Rusty red sands line the shores of this Canadian Province.

Iconic rock formations that allow for exploration during high or low tide.

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

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.