A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

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

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

A large camera obscura, constructed entirely from digitally fabricated components.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

One woman’s obsession gave birth to this lovely oddity at the Boston Public Library.

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

An enormous, inside-out glass globe built in 1935.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.