Hives

• Minnesota's Roadside Architecture

Grottoes

• Interestingideas.com (Grottoes and more)
• Grottoes of the American Midwest (Susan Niles)
• Grottoes (Thom.org)
• Online Grottoes
• US shrines
• Ave Maria Grotto (Roadside America)
• Dickeyville Grotto
• Dickeyville Grotto (Roadside America)
• Grotto of the Redemption (Roadside America)
• Wegner Grotto

Ruins

• Ruins