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

Every year, the colorful murals of Montreal get a complete makeover.

Two thirds of this Montreal neon icon has survived to flash another day.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

The skyline of Montreal includes the silhouette of an unexpected fruit-shaped Canadian staple.

A Montreal deli that was so beloved that it was allowed to circumvent their laws of language.

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

This 1967 experiment in modular architecture was designed to be a new model for urban living.

This whimsical fountain pays tribute to Toronto's four-legged friends.

A mysterious lake provides fresh water without any source, somehow restoring itself from atop its mountaintop perch.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

Collection of fossils, plants, and ancient animals encased in amber.

This trio of Dominican cave lakes comprise a colorful biosphere of natural life.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

Frida Kahlo's childhood home, now a museum of her life and works.

The famous artist couple lived and worked here, in two different houses connected by a bridge.

Twelve natural mummies are displayed in the crypt of this former monastery school.

66,000 pieces of art, donated by one of the world's richest men.

A Mexican Romeo-and-Juliet-esque legend has given this super-narrow alleyway a reputation for romance.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Mysterious stone tower featured in many alternative histories of the New World.

Avoid gangster interaction while window-shopping.