America's dirtiest hotels

Dirt-caked bathtubs, molding refrigerators and mystery stains are just a few of the horrors travellers say they've found at the Grand Resort Hotel and Convention Center in Pigeon Forge, Tenn. In the past year, disgruntled and disturbed guests have called the hotel everything from "cockroach heaven" to a "filthy, disgusting dump" and have plastered the Internet with sordid photographic evidence to prove it. That's bad news for the Grand Resort Hotel since generally the number one reason guests don't return to a hotel is because of cleanliness issues, says Howard Adler, director of Purdue University's Center for the Study of Lodging Operations.

In Pictures: America's Dirtiest Hotels

From a dilapidated California inn to a mold-infested Myrtle Beach flophouse, these are America's 10 filthiest hotels, according to a survey of reviews from 2010 on the travel website TripAdvisor.

America's Dirtiest Hotels

1. Grand Resort Hotel & Convention Center, Pigeon Forge, TN