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

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

Willy Wonka would love this weird half-a-home.

New Zealand's only running funicular railway.

The platform atop this verdant volcano was built with the help of a royal elephant.

Historic medieval fortified city in southwest France.

High winds can make this one scary landing.

This bridge was constructed from the rubble of the infamous Bastille.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

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

This insurance company building reminds customers that witches, bears, and gnomes are out there, best be insured.

Outdoor art exhibition made of classic Tetris pieces.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

Montreal's colorful subway station shows its support of the local LGBT+ community.

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

Brisbane's manmade urban beach has enough water to fill five Olympic-sized swimming pools.

A collaboration of art and ornithology mourns the calls of Sydney's lost birds.

Come for the flowers, stay for the bats!

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Tubing through a cave lit with glowworms is a magical underground experience.

This chimerical bridge/tunnel appears to dead end right into the sea.