The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

A sewing machine tycoon built this miniature castle for the people and to beautify a lakeshore.

This freshwater spring fills with 10,000 gallons of water per minute.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

A journey begins with a single step, and for many, the road-trip of a lifetime started at this Chicago intersection.

A tunnel with windows, so you don't miss out on the impressive views.

This historic railroad hotel built from Kansas limestone was once the most popular hotels for traveling salesmen in the midwest.

This small, nautical gift shop is home to a 500-pound behemoth.

Faces carved into the cliffs create an otherworldly walking trail.

A unique botanical garden housed in three giant geodesic domes.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A small side chapel in Santa Fe's basilica is home to the oldest statute of the Virgin Mary in North America.

A natural formation that resembles a camel resting in the New Mexico desert.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Art in the form of a winding, man made crack in stone.

The rustic cabin-like decor of this Arts and Crafts-style church reflects the love of nature central to its little-known theology.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

Olfactory delights in San Francisco's Botanical Gardens.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This extinct volcano rises above Edinburgh and is special for its panoramic views over the city.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.