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

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.

This temple was constructed entirely by Roman soldiers.

A tribute to the women who quietly kept the local steelworks alive during both world wars.

This police call box harkens back to an era of pre-radio communications, and has a rather unique feature.

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

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Its collection includes a broad array of social, geographic, graphic design, and political history.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The first declared National Monument in the United States.

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

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

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.

A swirling spectrum of stained glass dazzles visitors who enter this subway station.

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

An eccentric inventor's castle home with its own indoor weather system.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

Bouncing, delightful, mechanical art at the MIT Museum.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.