The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

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

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

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Two thousand artifacts from around the world collected by one woman who loved to travel.

Impossibly life-like natural history models created out of glass by a father and son.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Hill-like structures formed by glaciers and sandy spits of land.

A 60-room castle constructed by a horse-racing heir.

Solar powered Spectacle Island features all-green facilities.

Oldest synagogue in the United States.

Civil War Fort on an island in the Boston Harbor.

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