What has been the biggest tsunami recorded and where and when did it hit?

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The highest tsunami recorded was in Alaska in 1958. It reached over 500 metres high because the waves were forced into the narrow bay. Luckily only two people were killed.
The Lituya Bay wave is generally described as the largest tsunami ever recorded in modern times, and has been given the special name of mega-tsunami. It was caused by a massive landslide, triggered by an earthquake of magnitude 8.3. When the wave rushed across the bay it ran up the valley walls to a height of 576 m at its maximum, (1720 ft) and over 100 m for the rest of the bay area. Note the damage marks, especially top right of the picture, where trees were stripped clean away from the valley walls from hundreds of metres up the sides. Lituya Bay was considered to be a safe haven for fishing boats, as it was always calm, even during storms. There were three boats in the bay at the time of the earthquake and the resulting massive landslide, and incredibly two of the boats and their crew survived the mega tsunami to tell the tale.
The Asian tsunami on December 26th 2004 is the worst to have happened in modern times. Although it was not as powerful as the Krakatoa tsunami, it was particularly devastating because of the huge loss of life – the greatest ever recorded. The tsunami hit in the middle of the morning during the busy holiday season.

If the Cumbre Vieja volcano in the Canary Islands erupted it could cause a huge landslide. If it triggered a mega tsunami it could destroy the east coast of the United States.