Your idea of tacky's probably not the same as mine, but almost all are touristy:
Eva Peron's Tomb and her former office in the Ministry of Labor, Recoleta, BA
Lenin's Tomb and the Lubyanka (KGB, now FSB headquarters), Red Square, Moscow (he was dusty or that was 70-year old dandruff)
Jim Morrison's grave, Pere Lachaise, Paris
Frank Sinatra's grave, Palm Springs Cemetery District (Sonny Bono and Jolie and Magda Gabor are resting comfortably there, too)
Edgar Allen Poe's grave, Baltimore
The Stone Pony, Asbury Park, NJ
The Book of Kells, Dublin
The Henry Ford and Greenfield Village, Dearborn, MI
Katherine the Great's bedroom, The Great Palace, St. Petersburg ("I would not know, I was not there" per the Intourist guide)
Chichen Itza, Valladolid, Yucatan
Statue of Christ the Redeemer, Rio de Janiero
Disneyland/Disney World/Dollywood
The Big Merino, Goulburn, NSW and the Big Banana, Coffs Harbour, NSW
Monumento a los Zapatos Viejos (The Big Shoes), Cartagena
Sydney Harbour Bridge climb, Sydney, NSW
Plymouth Rock, Plymouth, MA (disappointing: cracked and small)
Palace of Westminster, aka Houses of Parliament, London (Stranger's, now Visitors, Gallery)
Versailles/la Tour Eiffel/Moulin Rouge, Paris
La Rambla/la Pedrera/la Sagrada Famila, Barcelona
Calgary Stampede, Calgary (as guests of two former Stampede Queens)
Niagara Falls, Ontario (staying in Marilyn Monroe's suite at the General Brock)
Church of the Holy Sepulchre, Jerusalem
The Warren G. Harding death suite, Palace Hotel, San Francisco (actually, not tacky and a lovely view into Union Square)
Graceland, Memphis, TN
The Texas State Fair, Dallas
Space Needle, Seattle
Kennedy Space Center, Cape Canaveral
Golden Gate Bridge, San Francisco (walked across)
Oxford Street Wall, Darlinghurst, Sydney
Moonee Ponds, Melbourne (Dame Edna's - not DL Edna's - home town)
The Little Mermaid, Copenhagen
Las Vegas, NV - it's all tacky and very, very touristy
The Hoover Dam, Clark County, NV
The Anne Frank House, Amsterdam
Luau, Royal Hawaiian Hotel, Honolulu
Titanic Museum, Belfast
Leaning Tower of Pisa, Piazza del Duomo, Pisa
Wall Drugs, Wall SD
"Innocent Victims," the Diana and Dodi statue at Harrods, London (since removed)