The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

This burial pyramid in central Ireland is thousands of miles and thousands of years away from its Egyptian inspiration.

This courtly monument celebrates an influential comedian who turned taking the piss out of the powers-that-be into an art.

A moody and picturesque riverside ruin overgrown with vegetation.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.