This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

A stone-filled garden in the heart of Edinburgh commemorates the father of modern geology.

Reportedly the "most handsome" market cross in Scotland.

The ruins of a 15th-century church once home to priests who prayed for a single family's salvation.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

One of two Irish-style round towers in Scotland, this structure has mysterious origins.

This unusual rock looks like a giant, otherworldly mushroom sprouting atop a cave.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

This demon atop the Notre-Dame de Paris looks utterly bored.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

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

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

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

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

Known as "Toronto's Flatiron."

Within the church are the relics of the martyrs St. Jean de Brébeuf, St. Gabriel Lalemant, and St. Charles Garnier.

The largest canoe collection in the world—and the most Canadian museum ever.

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

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

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

Small ship votives hang from the vaulted ceiling of this port-side church with a Latin inscription on the wall.

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