the bullet train
One famous landmark in Japan is the Tokyo Tower. It resembles the Eiffel Tower, and is even taller.
Mount Fuji
Yokohama Landmark Tower is a building found at Yokohama in Japan.
I don't know if they are the MOST famous, but Mt. Fuji is one, and Shibuya Square in Tokyo is pretty famous as well. > Tokyo Tower ; see related link below .
Fujiyama -- Fuji mountain -- Mt. Fuji
The most famous is Mount Fuji. Other landmarks are Himeji Castle "White Egret Castle", Itsukushima Shrine, Ogasawara Islands, the Fushimi Inari Shrine, Kinkaku-ji, Hiroshima, Jigokudani Monkey Park, and Kamakura Daibutsu where you can see the second largest Buddha statue in Japan.
If you think to Oni-no-Shitaburui, this is a valley, a touristic landmark in Japan.
Taj Mahal
One can find more about the Landmark real estate company on the official 'Landmark Company' website. One can also find information on the 'Visit Landmark' site.
The Stone Arch, in Cabo San Lucas (Los Cabos). See related links.
One can find Japan tours through several travel websites such as All Japan Tours, Japan Tour Vacations and Voyage Trek. One could also contact a travel agency to see if they book Japan tours.
Japan has a number of UNESCO World Heritage Sites and what could be considered "landmarks," but is probably best known for Mt. Fuji.