Exact replica of the ancient monument, but much, much lighter.

Fill up your senses in this beautiful riverside garden, dedicated to the works of singer-songwriter John Denver.

The ruins of this long-abandoned unsuccessful gold mine can still be found.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

The romance of early commercial flight still fills this Art Deco destination.

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

On the Hudson resides one of the largest clocks in the world.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.

There’s a special club house at the top for the bell ringers.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The U.S. Navy's last diesel-electric submarine rests half-submerged in the middle of Portland.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

A sculpture of a salmon swimming through a brick building.

Tiny horses tethered to antique rings are scattered around the city.

10,000 flowered plants bloom in the City of Roses.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

This magnificent museum claims to house the cranium of a disciple and the skull of a pope.

Yo, Adrian!

The world’s first penitentiary, meant to be humane, drove men insane.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

This island hill is strewn with boulders carved by shipwreck victims from the age of sail.