Descendants of this colonial Pennsylvania family still travel from far and wide to visit the 300-year-old home of their Quaker ancestors.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

Painstakingly built dioramas sit unnoticed in a Boston office building.

This expansive bridge in the Canadian wilderness was originally just built for friends.

This work of engineering is imbued with elegance and ingeniousness.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

A historic observatory precariously perched at the "Top of Europe."

Beside the pew where C.S. Lewis often sat while attending church, a window filled with characters from his beloved stories.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

At night, this glittering musical tunnel draws skaters and photographers.

Located more than 600 feet beneath sea level, this tunnel boasts the world's first undersea roundabout.

J.R.R Tolkien, C.S. Lewis, and other "Inklings" met at the Oxford pub to discuss the now legendary fantasy stories they were writing.

The beautiful non-repeating pattern honors the Oxford professor who discovered it.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The most beautiful Taco Bell in the world even has surfboard parking.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

Built around 1845, this house was occupied for 100 years, serving as a home to a prosecuting attorney, a Union Civil War general, and a wealthy socialite.

Designed by Horace Trumbauer in 1893, this Gothic-style castle is now a home for academics.

In northern Ohio, the glorious past of America's trains is on full display.

Train fans from all over flock to this railroad viewing park where three lines converge.

The classic Christmas carol was written at this Massachusetts tavern in 1850.