One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A prohibition-style speakeasy takes up residence in the last Victorian residence in Hollywood.

A psychedelic labyrinth on the San Francisco bay.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A huge musical instrument played by the ocean.

California's oldest wind harp represents a historic piece of America's Danish history.

This former lieutenant governor's home is brimming with curiosities.

Golden Gate Park's historic collection of plants.

A "haunted" landmark on the coast of Southern California.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Go inside to really appreciate this 500-year-old technological masterpiece.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

This curious, round temple is the oldest still-standing marble building in Rome.

The 10-foot-wide Long Beach home was built on a dare.

Rome’s legendary peephole vista is also a former Crusader stronghold.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This is the oldest Roman-made bridge in the city still existing in its original state.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.