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Clara Furse is the CEO of London Stock Exchange

The London Stock Exchange was established in 1801.
It is one of the largest stock exchanges in the world, with many overseas listings as well as British companies. The LSE is part of the London Stock Exchange Group plc.

The London Stock Exchange is located at Paternoster Square close to St Paul's Cathedral in the City of London.

Here is the Map to get there.

The LSE is owned by the London Stock Exchange Group plc.

The London bourse became publicly traded in July 2001, when it abolished ownership restrictions on its shares. Shareholders of the company, previously controlled by the brokers who trade on the exchange, now include funds run by Threadneedle Asset Management, Barclays, UBS AG, and Fidelity Investment.

NASDAQ was founded in 1971 by the National Association of Securities Dealers (NASD), who divested themselves of it in a series of sales in 2000 and 2001. It is owned and operated by the NASDAQ OMX Group, the stock of which was listed on its own stock exchange in 2002, and is monitored by the Securities and Exchange Commission (SEC).

NASDAQ is owned by The NASDAQ OMX Group

Sensex and nifty are indian stock markets.

Bombay stock market is called as "Sensex".
The BSE Sensex or ay Stock Exchange Sensitive Index is a value-weighted index composed of 30 stocks
It consists of the 30 largest and most actively traded stocks, representative of various sectors, on the ay Stock Exchange. These companies account for around one-fifth of the market capitalization of the BSE.

Nifty:

NASDAQ is a computer-based market with redundant systems to avoid crashing or ism. As such, they have no real location.

But they do have corporate offices at:

The NASDAQ Stock Market
One Liberty Plaza
165 Broadway
New York, NY 10006
Phone: 212-401-8700

To know at what number the NASDAQ stock market close yesterday just enter the date and click on Get Prices in the following page.

If you look at the NASDAQ MarketSite Tower from 20,000 feet, you realize that the apparently simple act of providing a stock exchange actually has three separate components:
The interface -- The place where broker dealers and market makers gain access to the system.
The matching engine -- A computer that connects buyers and sellers when their prices match.
Quote services -- Data feeding the buy and sell price quotes that NASDAQ provides.