Shop of curiosities with a dinosaur museum tucked in its basement.

A science teacher's dream.

A monument to the art of slicing people open.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A speakeasy takes on Chicago's drinking culture.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This shop for all your super spy needs hides an educational secret.

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

Symbolic attempt to overcome the issues of life.

If astronomy had a ghost, it would look like this observatory.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

Display that gathers the basic elements of the universe in one convenient location.

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

The longest navigable underground river in the United States is home to countless blind and albino animals.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

An ode to the classic piece of British street furniture.

The first German gnome who popularized the garden decoration.

A relic from one of London's worst 19th-century slums.

One of the last free public hot springs is decorated with hippie art.

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

An inconspicuous footbridge beloved by San Diego locals.

Nancy Thompson's Home from "A Nightmare on Elm Street."

The stones that traveled from Spain to eventually become a holy place for San Francisco's nature worshippers.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.