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

This unusual structure may be on its way to becoming a cultural landmark in Toronto.

Few other hotels can rival the grandeur of the Castle in the Rockies.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

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

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.

The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

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

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This mine was once used to defend the coast from attack during World War II.

Commemorating the landing of William of Orange with his European army on their way to the Battle of the Boyne.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

Legend says this sacred tree was a gift from goddess Athena.