The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

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

Sweden's "good old days" painstakingly re-created in a model village.

This expansive bridge in the Canadian wilderness was originally just built for friends.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Three columns of volcanic rock shoot out of the ocean.

Medicinal spa created with the discharge from a geothermal energy plant.

An encyclopedic collection of mammal penises.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

San Francisco's newly reopened hands-on science museum.

Only hotel where you can legally launder money.

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

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

These strikingly barren, rolling red hills were caused by bad farming practices.

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

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

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

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

Megachurch turned Catholic church comprised of 10,000 glass panes.

A very classy 1920s-era bar right in Grand Central Station.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Elevated freight railway turned wildly successful urban park.