A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

A corkscrew-shaped barn in Ireland.

The blinking light atop the iconic landmark has been sending secret messages for decades.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

A historic dam made famous for its turbines and feature in a Hollywood classic.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.