This foreboding medieval castle was twice besieged by barons rebelling against the English king.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

In this truly magical place, rent hasn't been raised since the year 1520.

This nonsensical smiling boat shuttles passengers between two places they could've easily walked between.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

Roses and other fascinating flora fill this garden built to commemorate Britain's immortal Bard.

This house renovated by Frank Lloyd Wright was the centerpiece of a lavish 20th-century estate.

A former atom smasher turned into an art gallery.

A towering Art Deco movie palace made to look like a Mayan temple.

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

This softly rounded mansion was built without corners not to avoid evil spirits, but to make them more comfortable.

You can take a class, browse the library, or visit the lavish lair of an international men's humor society.

This memorial plaque remembers a strangely shallow maritime disaster known as "Chicago's Titanic."

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

Once called the "Polish Gold Coast" it is an icon of the neighborhood that bears its same name.

Orthodox church partially financed by Tsar Nicolas II.

This historic-shipwreck-cum-diving-spot can still be seen poking its boiler out of the Lake Michigan waters that claimed it.

A plaque marks a former safe house on the secret route, now hidden next to a McDonald's.

Arguably the best example of an authentic Dutch windmill in the United States, rivaling its counterparts in the Netherlands.

One of the last functioning antique elevators in Chicago.

Tour the luxe "glass cage" that inspired and unnerved the architecture world upon its debut.