A cluttered and astounding collection of antiquities and curiosities.

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

A monument to the 17,000 Chinese who worked and died to build Canada's Pacific Railway.

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

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

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 England's most famous churches hides a pair of little known architectural treasures.

Huge winged monument in the United Kingdom.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

Climb to the top of this windmill for a scenic panorama and up-close look at wind energy production.

A magnificent Victorian garden that brings the charm and style of old-time aristocracy to the 21st century public.

Catacombs turned marketplace.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Hear the quietest sound from across the dome.

This luxury shopping lane has been protected by its own tiny police force for over a century.

Breathtaking and huge 430 year old maps of Italy.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.