A view-altering observatory at the University of Texas.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

Twenty churches beautifully painted by 19th-century Czech and German immigrants in Texas.

An oddities shop packed with twisted treasures inspired by Oscar Wilde and Edgar Allan Poe.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

Visitors can walk over the largest concentration of Columbian mammoths to have died from one event.

A grove of colossal man-made flowers built to collect the sun's rays.

Mysterious glowing orbs float through the desert night.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.

An emerald-green grotto just a short trip from Austin.

A popular swimming hole that hides one of America's most deadly diving spots.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Nikola Tesla's former home contains an homage hidden from plain sight.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

One of the last Jazz Age "Wonder Theaters" in New York City.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

A masterpiece of LGBT art has been restored in what may now be the most valuable restroom in America.

A very classy 1920s-era bar right in Grand Central Station.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.