Five miles of underground river link lake to ocean.

This concrete residential area doubles as an open-air gallery.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A restaurant and observation deck built in a unique broadcasting antenna.

Started as a kitchen garden, now the second largest botanical garden in the world.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.

Most famous work of one of Frank Lloyd Wright's sons.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A tribute to a great Texas blues musician.

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

Locals dubbed it the "Owl Building" because of its bird-like appearance.

A small island hides in plain sight on Austin's Lady Bird Lake.

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

Turning night into day in Victorian-era Austin to thwart a serial killer.

Home to an endangered salamander, a full moon celebration, and a large spring-fed outdoor swimming pool.

This simple frog painting created by musician Daniel Johnston embodies the spirit of Austin.

A store full of vintage and indie toys designed to bring out the kid in even the crustiest of adults.

This eclectic Austin curiosity shop is home to all things strange and unusual.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

One part antique store, one part curiosities hodge-podge.

Continuing the tradition of the dime museum in style.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.