Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Look closely and you’ll notice that the color changes a third of the way up the tower.

While most wind tunnels test scale models, the "Cave of Winds" was large enough for actual airplanes.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

Home to items never before seen by the public.

There aren't too many operational funiculars around, but Pittsburgh has two!

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

New York's southernmost subway station is whimsically wavy.

One of the largest underground systems runs under Canada's largest urban center.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A swirling spectrum of stained glass dazzles visitors who enter this subway station.

Dispersed across 45-acres, 39 structures house a massive collection celebrating American Folk Art.

Lake Champlain Bridge, the recently demolished and rebuilt bridge where they filmed "What Lies Beneath".

Cryptid lake monster honored with its own monument.

Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

Scary metal statues adorn some of the signature buildings of Burlington, VT.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

This small-town pizzeria won the Hollywood lottery.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.