This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

Austin’s local mountain isn’t really a mountain at all.

Roadside Americana, fairy tale characters, and Austin quirkiness come together at this magical course in the heart of Texas' capital city.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

An overlooked memorial honoring the local Washington residents who died in World War I.

Look closely and you’ll notice that the color changes a third of the way up the tower.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Home to a vast and influential collection of Shakespeareana.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

A taste of Middle Earth, in the middle of the Bayou City.

Artist James Turrell's ode to dawn and dusk on the campus of Rice University.

The world-record holder for the longest bridge stretching continuously over water.

Shop for books in the New Orleans house where William Faulkner once lived.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

This Neolithic passage tomb forms part of a World Heritage Site.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

This beautiful 19th-century temple stands atop the ruins of its predecessor.

An abandoned train station in Munich constructed for the 1972 Olympic games.

This 14th-century temple is also known as the "Temple of the Golden Pavilion" for its gorgeous gilded reliquary hall.

This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.