The frozen bubbles that form on the icy surface of this Canadian lake contain enough methane to create a small explosion.

A hiking area billed as a possible home to Bigfoot.

A crumbling cliffside ruin hidden in the woods.

The entire length of the border is marked by a 20-foot-wide slash through the trees.

The highest tides in the world come in and out here twice a day, allowing you to essentially walk along the ocean floor.

The world's largest dark sky preserve is a Canadian park established to preserve the country's last wood bison.

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

Cliffs that hold fossils, including the earliest known reptile, dating back more than 300 million years.

Surprisingly Delicious Asian-Style Hot Dogs.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

The bronze uniforms commemorate the vital role of women during World War II.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

A unique tribute to the millions of animals who served and died for the British military.

The commemorative stone column conceals a secret laboratory.

An architectural oddity hides in plain sight on this iconic London bridge.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The falls were named for the mistaken idea that they were the ones pictured on the Canadian $5 bill.

This memorial to a horrific ship collision sits over a mass grave holding dozens of the victims.