The housing complex served as an anti-fascist fortress during the Austrian Civil War.

This replica of the Greek structure is in the heart of Nashville.

Victorian-era Egyptomania left its mark on this Nashville landmark.

A museum in the former home of Marxist revolutionary Leon Trotsky.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

After the parade, students throw their beads on the tree hoping for good luck on exams.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

An Irish Memorial commemorating those who perished due to potato blight.

The oldest landmark of Toronto is a testament to shifting sands.

A memorial to the tens of thousands of Irish who fled to North America during the Great Famine.

This Hindu temple is an architectural marvel designed and built according to ancient Indian principles.

Lost subway station nestled beneath Toronto's busy commuter line.

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

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

The former house of an anthropologist couple displays Lacandón Maya artifacts in a homey atmosphere.