A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

The site of William McKinley's tragic assassination is only marked by an underwhelming boulder.

This restored house is like a time capsule of the president's unconventional inauguration.

The absurd creation is a compulsory destination for selfies in Buffalo.

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

Prayers and messages of hope decorate the ceramic tiles of this pavilion.

A group of artists transformed this desolate city alleyway into an outdoor gallery of street art.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

Considered by many to be one of the most dangerous highways in Alaska.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

Legend says one of the world's largest marine geysers is actually a whale that got wedged within the rocks.

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.

The painted and decorated towers of this Hindu shrine were once the tallest structures in one of the oldest cities in India.

This Gothic-style church is reputedly built atop the remains of one of Jesus's apostles.

The first English fort built in India.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

World's largest bell sits on the grounds of the Kremlin in Moscow.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

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