Metal

This prefabricated building was built in Belgium and shipped to Mozambique but was never inhabited, since its iron exterior was unsuitable for the tropical environment.

Before its closure in 2002, this South Dakota mine was the largest and deepest gold mine in Western Hemisphere.

A small mountain made entirely of banded iron stone overlooking downtown Ishpeming.

A giant scrap metal troll rests his hands on top of a dilapidated building covered in graffiti.

A charming easy-to-miss sculpture garden filled with whimsical and thought-provoking metal sculptures.

The original building of a mining school endowed by one of the barons of the Comstock Lode now houses a museum of earth science and mining history.

This iron building in the Amazon allegedly shares an architect with the Eiffel Tower.

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

The only United States mine for magnesium carbonate has been operating continuously since the 1930s.

A place to appreciate the sweat and ingenuity it used to take to make a pot.

These conical kilns measure an impressive 30 feet in diameter, and were once used to produce charcoal for a local blast furnace.

A monument commemorating the antimony mine that once operated in this Melbourne suburb.

Dozens of large steel sculptures fill this two-acre park outside a former blacksmith's studio.

The Paul Bunyan of the steel industry.

The remains of a massive blast furnace in what was once one of the country's largest iron-producing regions.

Nicknamed the "Grand Canyon of the North," this open-pit mine in Minnesota has a much shorter history.