When in Budapest I'd say be sure to visit the old Jewish Quarter. It's one of the most interesting if sometimes overlooked by tourists part of the Hungarian capital.
It was established at the turn of the 19th century when the community gathered in the 7th District along the road leading to the bridge. The center of this area became Király Street. In 1944 the Pest Ghetto was also built here crowding 70.000 people together.
In 2002 this historic neighborhood bordered by Király and Csányi Street, Klauzál Square, Kisdiófa and Dohány Street and Károly Boulevard was named the old Jewish Quarter of Pest and entered into the World Heritage Conservation Zone.
This area is home to most of the city's Jewish cultural heritage sites, including the famous „Synagogue Triangle.”
At Dohány Street 2. you will find the world's second largest and Europe's largest synagogue, the Dohány Street Synagogue. The site of this building is also the birthplace of Theodor Herzl, Father
of Zionism. In the garden is the Martyrs' Cemetery and the Raoul Wallenberg Memorial.
The second point of the Triangle is the synagogue on Rumbach Street, also known as „the little synagogue.”
The third point the Kazinczy Street Orthodox Synagogue. This area is home to kosher shops and Budapest's only mikveh (ritual bath).
This historic district, as a part of the city's rehabilitation strategy, started to to look towards youth culture and tourism in recent years: from 2002 some now very popular cafes, bars and summer
music venues opened in buildings that were earlier considered for demolition: the Szimpla-garden, the Gozsdu Mano Klub, or the Kőleves (Stone Soup) -garden to name a few. Since then the area,
especially Kazinczy Street is not only known for its rich cultural heritage, but for it's unique "ruin pubs," art and design shops and nightlife.
for more information on this historic area I recommend visiting this site:
www.jewish.hu