The hallowed remains of a 900-year old Ancestral Pueblo great house.

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 urban oasis is a marvelous meld of music and landscape architecture.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

The oldest farmer's market in America is so ancient it was approved by the King of England.

One of the few remaining covered bridges in Lancaster County.

On the outskirts of Pennsylvania’s capital city, a reminder of the worst accident in U.S. commercial nuclear power plant history.

These unique rock formations were created during the Ice Age.

An industrial waste tourist attraction.

Don't get it twisted: This is the oldest pretzel bakery in the United States.

These are probably the most beautifully crafted toilets you've ever seen.

Catacombs turned marketplace.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

This ancient Egyptian obelisk still bears the wounds of World War I.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

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

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The costumes depict the Kurent, the star character of the annual Kurentovanje festival.

The world's oldest grape-producing vine has survived four centuries of turmoil and even has its own anthem.

A whimsical bridge adorned with decorative dragons.

Strange rumors surround the artist who created these solemn metal guard dogs.