This site is home to ancient petroglyphs and pictographs dating back to 6,000 B.C.

One of the "twins" in these falls on the Snake River was sacrificed for hydropower generation in the 1930s.

A museum dedicated to the history and art of staying clean.

A ghost town that held steady longer than most, but finally gave up the ghost.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

A former sanitarium where soldiers were sent to recover in the healing waters of hot springs.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

Built for a motel, this cartoon dino is now a symbol of the area's paleontological heritage.

Almost all that remains of a town dedicated to supporting the First Transcontinental Railroad.

A desert settlement founded and later abandoned by Hawaiian members of the Church of Jesus Christ of Latter-day Saints in Utah's Skull Valley.

This large, castle-like structure is hidden amid the mountains on the grounds of the Utah State Hospital.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

These 2000 year old remains of a Roman aqueduct are hidden inside a hotel lobby.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

This fountain was designed to honor the man who helped bring water to Barcelona.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Saint Joseph was said to heal the deaf and blind, but it was a much smaller miracle that got him canonized.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

One of Antoni Gaudí’s earliest buildings, built between 1886 and 1890 for the industrialist Eusebi Güell.