A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

The world's oldest Jewish library was founded by Sephardic Jews in 17th century Amsterdam.

An entire street built on the foundation of the first wall of Amersfoort. It has 61 national heritage sites in the street itself.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

The last of Amsterdam's original sea level markers remaining in place.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

One of Amsterdam’s most popular cultural and recreational complexes is on the site of a former gas works.

This massive circular sculpture may not be a portal to other worlds, but it does inspire the mind to imagine them.

A unique World War II memorial commemorates where the American B-17 bomber Man-O-War crashed.

The Ortega family started their iconic food company in this small, adobe kitchen.

For over 20 years, Lil Toot has delighted guests with narrated boat rides between Stearns Wharf and Santa Barbara Harbor, becoming a beloved local legend and top-rated experience for visitors.

Bug-devouring flora are the stars of a special wing of the glass conservatory.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

Art Deco stylings conceal the true nature of this bridge.

One woman's Viking Castle on Lake Tahoe.

This trench, some 2,300 feet long, is only the most prominent relic of a largely forgotten episode of placer mining on the east slope of the Sierra Nevada.

This large chunk of dark rock is a relic from an ancient volcanic eruption.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A volcanic cone that formed over 600 years ago.

A new monument to an old grave that was uncovered during the rebuilding of a California ghost town.

A natural dome made of volcanic glass in Inyo National Forest.

This rock formation named for its unique shape is one of many that call the Alabama Hills home.