An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

This giant tower beacon was a key navigation tool for pilots delivering mail amid the night skies.

Experience a charming 1930's version of "infotainment."

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

A stunning Victorian abbey and walled garden on a lakefront.

The ancient tomb acts as a calendar that keeps perfect time.

These fly sculptures are scattered around the city and represent the patron saint of Girona.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A pixel art killer whale is frozen mid-leap in this Vancouver square.

Perhaps the world's only gas station inspired by a political scandal.

In Washington's Yakima Valley lies a town "where dinosaurs roam."

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

An extraordinary mixture of natural beauty and man-made phenomena.

A sacred lake composed of over 300 separate pools of highly concentrated minerals.

Hidden inside a gift shop that doubles as a museum, this gargantuan yo-yo can only be operated by crane.

The world's largest military aircraft cemetery.

Limestone caves with spectacular showcase chambers.

The biggest solar telescope in the world helps reveal the secrets of our sun.

During World War II this was the site of an "honor camp" used as a prison for draft dodgers, Native American conscientious objectors, and Japanese-Americans—including a man who brought his case against the camp to the Supreme Court.

The first Protestant church in Arizona and only Gothic Revival style adobe church in the world.

An 18th-century Spanish watchtower made entirely of seashell and concrete.